All of this.
OP, you call it Anti-Intellectualism. That sounds scary and wrong, and like we're going to execute people who wear glasses because fuck the smart people, we're literally Pol Pot.
That's not what this is. This is not a wave against intellectual thought, it is not a movement against people whose strengths lie in intellect, intelligence, discourse. This is a reaction to what the idea of an "intellectual" has become.
That being, someone who went to university, and while being "totally unique and smart and non-conformist, incredibly informed," has political ideals that align exactly with all their friends, all their professors, all their news sources, and everything their politicians tell them.
But, really, the huge reason? It's how smug they are. It's not just what they're saying, it's how they've said it for decades. It's how they react to criticism. It's never an intellectual discourse, they never shut you down with ideals and argument. They just prefer to call you racist, sexist, xenophobic, homophobic, misogynistic, bigoted, transmisogynistic, evil, sick, and wrong, and then back it all up with half-baked university ideologies involving privilege, patriarchy, rape culture, and just why white males are the source of every problem and ill of the world. They will do that regardless of your race or any ACTUAL inclinations you might have, and when asked to define or present reason for any of that, you will find that the definition is ever changing, nebulous, and oh, just SO hard to really pin down like, I can't EVEN right now, how can you NOT know?
That's our experiences, that's our lives, and most importantly, that's how our media has been treating us. That's the sort of PC, "intellectual" stuff that's been shoved down our throats for three decades plus now, all sourcing from the same subversive university madness.
You call it anti-intellectualism. I say it's us being done with their bullshit.