Spider-Man and Batman had successful film franchises in the 2000s. The superhero boom was already starting back then. To go back to when it really wasn't popular, you're probably looking back to the 1990s, though Batman 1989 was pretty huge.
The 2000's wave of superhero movies is kind of distinct from the 2010's capeshit boom that became the dominant trend in blockbusters with the MCU.
The first two X-Men movies, the Dark Knight Trilogy, and the Sam Raimi Spider-Man movies were all pretty popular while most of the other superhero and comic book movies of the 2000's were either mediocre (The Punisher, Sin City), just plain awful (Daredevil, Hulk, Superman Returns, Catwoman, The Spirit), were major flops but were decent (League of Extraordinary Gentlemen) or at best wound up as sleeper hits thanks to the internet (300, V For Vendetta)
Keep in mind that before 2000, the rule of thumb was that superhero movies sucked. Tim Burton's Batman movie and the first two Superman movies from the 70's were considered the rare major exceptions to the rule.
When Blade came out in the late 90's, the studios went above and beyond to not mention it was based on the old Tomb of Dracula comics from the 1970's. Instead they presented it like a Gothic-Punk vampire flick with no real ties to the rest of Marvel.
X-Men came out in 2000 came out and did pretty good and warranted a sequel and Spiderman came out in 2002 and did even better and was even more popular, then it was off to the races. X-2 and Spiderman 2 were extremely popular and beloved, but pretty well everything else except the Nolan Batman movies was mediocre and followed this dumb formula where you spend half the movie before the hero or villain actually get their powers. You had Catwoman, Hulk, Daredevil, Fantastic Four, Ghostrider, Electra, etc. all of them falling somewhere between mediocre and terrible.
The big difference is in 2000s they were viewed as dumb popcorn movies that people didn't take seriously, and it'd be a night out with your buddies or family and then it was done and now people act like Marvel Universe movies are on par with fucking Citizen Kane.
Pretty much this. The first major "superhero boom" in the 2000's that emerged in the wake of the first two X-Men movies and the Sam Raimi Spider-Man trilogy was seen as one fad out of many and there was a lot more diversity in summer blockbusters in the 2000's and mid-budget movies still existed as well.
The one bad Hollywood trend of the 2010's that was just as big of a deal in the 2000's were the endless and incessant remakes, although they were usually not intended as politicized reboots and just wanted to cash in on the name.
Dawn of the Dead 2004 and Ghostbusters 2016 were both god-awful and disgraces to the original movies but Dawn '04 didn't actively insult their audience, which is why it was a financial success and is seen as one of those "Love It or Hate It" remakes while Ghostbusters 2016 was a colossal flop that even the hardcore SJW's quit trying to defend it once The Last Jedi came out.
You would be surprised. Going back to my experience with the animation community, typically Family Guy had a huge influence on them, yet they will rip it a part as mindless garbage that they used to like. PC types may hate South Park now as it is the “unintellectual and hateful drivel” of today, but just like Family Guy, it likely had more of an impact than these people want to admit. Same goes for other shows like SpongeBob typically. I guess it is a form of maturing.
It does not help that South Park attacked PC culture while it has historically been left wing in 2015. They likely just lost the audience as their fans grew worse than expected. But I cannot know for sure, I will admit. Just something about South Park’s cultural significance strikes me as an enabler.
A lot of the "CalArts" Tumblr artists and animation crowd take a lot of influence from Family Guy, South Park, and anime despite the fact they generally profess a hatred for all of those things and deem them as "problematic"
South Park was never left wing. They mercilessly mocked Al Gore in the early series.
Also if you seriously think the BLM riots this year were because of cartoons, I really don't know what to say. The left going crazy is caused by the behaviour of the news media and politicians, not fan communities.
South Park always was a "chaotic neutral" wild card that would mock anyone and everyone, be they on the left, right, or center. Trey Parker and Matt Stone were both registered members of the Libertarian Party back in the early 2000's but IIRC, they've even mocked the lolberts too.