After all, who's heard of a "Nazi bar"? I don't think those actually exist outside of the fantasies of liberal media's heads
Is your idea of extreme music Limp Bizkit and Disturbed?
Breaking it down, in the associated 'punk' scenes - hardcore, extreme metal, etc - people often wear "battle jackets" that they sew patches into from the shows they attend. Think Styx's retarded getups. Yeah it's cringe consumerism, but it's just what the culture does. So what some people will do is they'll stitch in a band that has definite connotations -
Burzum - as well as lesser-known Nazi symbolism, like the
Sonnenrad, and they'll see if they get checked at the door. If you bounce for places that play anything meaningfully alternative, you learn to spot the patches and you kick the people out like the story describes. If you don't, they do exactly as the story describes.
I don't know if I believe the idea of "covered in nazi symbolism" so much as "covered in band patches of white power bands," which exist aplenty in the underground/alt scenes. Yeah fucking obviously these aren't going to be bands anyone's heard of in the top-40, they tend to be local groups that tour maybe within their state at most, playing at dives and house shows. No bar is expressly a "nazi bar," that's retarded, but word about who the place lets in gets around. None of these discord-servers are explicitly tranny servers, but when you see 'lgbtqia+ friendly' or shit like that, you know what to expect. When you see a dude with an iron cross patch on his vest sitting at the bar, you know what to expect.
What's key is that the story establishes that these guys use effectively dogwhistles - the patches on their vests - to scope things out without calling attention to themselves, then they covertly convince the management that they're bringing good business, are good for growth, and aren't going to scare people away. Then, they make the business almost totally dependent on them, ruin any chance of normal people patronizing the place by association, and co-opt it into their stupid political retardation, only going mask-off once they've fully infested the place. A lot of the time the owner sympathizes with them anyways, but there are cases where you have clueless first-time-businessowners oblivious to this stuff.
It's the same playbook with trannies. uwu shit isn't just them being insufferably gay - that kind of stuff is them testing the waters to see what they can get away with. The initial-wave troons don't post porn publicly because they're porn-addicts (I mean they are, but that's not why they do it): they want to see if the owner will let them slide, let them get away with it. The main difference is that they've successfully gaslit people into thinking that's just them "expressing who they are" rather than what it actually is.