i had a whole thing written out but i realized that i don't actually care to try and respond to hypothetical situations that don't actually happen and anecdotes that amount to "hey some people are hypocritical assholes."
sufficed to say, none of that is an argument against how safe spaces or content warnings are used in actual practice in the real world, they're just arguments against a strawman.
like the video actually said (did you even watch it???) a safe space is literally just a place where you can go and you know someone's not gonna yell a slur at you, or try and throw a punch, or spit at you, or anything else you might be worried about.
and content warnings in practice aren't a "blacklist of topics you CANNOT SPEAK ABOUT" it's just a preamble before potentially upsetting content to warn about said content. Like, people talk about censorship, but *what censorship?* The content being warned about is still talked about, it's still posted. It just has a bit of a warning beforehand, same as "you might want to sit down for this," can be followed by the person saying "I'm not in a good position to hear bad news right now," which would be the equivalent of a student with a trigger for that leaving the classroom. Unless you have an audience of one person who goes "no I can't deal with that right now," at no point are you prevented from talking about or posting your content. You're not being censored whatsoever.
as for "if it's not approved of it gets ignored," pretty much any time someone asks for a content warning, most people are courteous enough not to grill them for exact info on *how* this thing triggers them, or to tell them "you can't be triggered by that, get out of here!" they'll just say "oh whoops sorry, is that better?" (if the content in question can be edited)
as for the gay thing, there's an actual debate in places regarding that, whether "gay" should be a content warning or not. It's not a clear-cut yes or no to, people actually involved (and not just condemning it from outside with no understanding) are arguing about whether "gay content" should be warned about. I don't believe it's necessarily because "people might have been abused by a gay person!" but it's still a debate ongoing.