You pretty much can affect children in a way that they might develop something sexually. Sure, it's not as simple as "show kids rainbow and it will automatically make them gay", but sexuality is complex. One thing that I notice about these people is that they say their first feelings that they were getting as tweens and early teens is a proof that their sexuality is natal and normal, but being a decade old is already old enough to be packed with all sorts of things that you were conditioned into, be it openly, or something have misfired in your brain. Not sure if I'm making sense here, basically what I'm trying to say is that you aren't a blank person by the time you hit puberty. Children express early signs of socialization after they're born, there were some studies that showed that newborns cry with a different accent depending on where they were gestated.
I suppose that makes sense, that you can influence somebody's sexuality and fetishes via pavlovian response and stuff, but it's more complicated than that. Let's take music for instance, various different cultures had developed their own notation systems and rhythms that may feel alien to western ears, but to those raised by such melodies they may seem natura, and find western music unnatural sounding. However, that can backfire, I think we all have heard anecdotes of somebody coming to despise country/folk music, because they come from some fuckass rural town in a middle of nowhere where the radios, the concerts and family gatherings all play the exact same music over and over again for multiple decades. One I've heard had somebody straight up stating that during their whole childhood they believed they hated music itself, because their pensioner filled small town only ever listened to soviet era russian pop and it wasn't until they moved to a city they realized that they love music, they just REALLY did not like the music they were raised with. By that logic, I don't think it's that unlikely that some woman in 19th century Victorian England would develop a lesbian attraction or become straight up asexual, simply because they spent most of their lives living in an industrial port town, where all the men are bearded unkempt sailors, coal smeared miners and soulless factory workers, all of whom reek of sweat. While the women by contrast would spend some meagre funds of theirs to buy make up, get dresses or read books - looking prettier, smelling prettier, sounding prettier. That could influence a small girl's sexuality to get queer, even if society itself is extremely conservative. The same can be true vice versa, that overabundance of queer media can make a boy perceive a straight relationship as even more mystical and touching.
You can influence a child to adopt certain interests or behaviors, but it can end up just being RNG. At the end of the day, they are human, they aren't robots, parents wish if raising children were as easy as giving certain input and it guaranteeing a specific output, but very rarely does it work out like that. It is not uncommon for people to come from highly conservative backgrounds where every part of their life is regulated, only for them to grow up and have no clue how to regulate anything themselves which causes them to go completely rabid and wild with sex and drugs, while at the same time, have multiple siblings that have gone through the exact same upbringing they did and not experience the same fallout from their conservative values. And this is all not even getting into romantic attraction, if it's even possible to condition a preference with such strong emotions, that sometimes is comparable to being on crack cocaine.
The whole "I got beaten up" story would have left an impression on me years ago, but right now it's just... It's drama for the sake of drama.
The whole "I got beaten up" as an argument does hinge on appealing to emotion to prove a point. What happened was still horrible, but you probably witnessed people using similar argumentation numerous times in the past only for it to become apparent that they massively exaggerated the events or even straight up lied, which made you more skeptical. Nothing necessarily wrong with that.
[she] then proceeds to say "I thought the problem was ignorance. But no, some people weren't confused, they just hated us." I don't even know how to begin to unpack this. How many of these "haters" were actually people rightfully criticizing live human experiments? I can't even take her words seriously because I was around these people long enough to know that they're lying and intentionally framing everything to be seen as victims.
I'd fully get the argument if you were referring to a westerner, but they are from Russia. That place is a shithole, you can't so much as hold up a
blank sheet of paper without risking getting arrested. There are neo-nazi groups that effectively engage in
lynchings of ethnic minorities and it can take over a decade for the perpetrators to be found, if they are ever caught at all. Basically, everything SJWs accuse Trump's America of, that's what Russia actually is. For all it's faults, America remains the pinnacle example of freedom of expression, where not even burning the country's flag can easily be banned without a constitutional court (even western countries like Germany have the burning of their flag banned, let that sink in). So a lot of western political groups need to adopt a persecution complex in order to create urgency in countries where political persecution is rare to non-existent. But in the case of the girl in the video... I don't think it was a persecution complex. If she kept publicly arguing about LGBTQ rights with people, she would've eventually gotten fined, arrested or even beaten for it. And I am not exaggerating in saying this... but she would be unironically safer talking about her non-binary identity on Kiwifarms than doing so publicly in Russia, because unlike Russia, Kiwifarms actually respects freedom of expression, it has it woven into it's identity. Even feminists are able to find their space here, create their own private threads and friend groups where they get to talk about how much they hate all men.
Although... the most hilarious bloody irony in all of this, is that people from such extreme circumstances rarely get their voices heard. You'll see dozens of news articles of drag queens weeping over being called a poopoo head while living a lavish lifestyle of a celebrity, while all the stories of LGBT people needing to escape Saudi Arabia over fears of being hanged by a noose hanging from an excavator never get the same level of traction, because they are way too dark, they are way too real, these aren't marketable stories. Hell, the video you found has barely over a 1k views. Actual real persecution just doesn't gain traction, because people only want to see and hear feel-good stories.