It sure does sound like it to me. If not why not? If so, why have I not seen you call it out?
This is classic racism and fascism
1) She takes upon herself the right to discern who is and who isn't authentic. That is fascism
Fascism is when you paint your ideological opponents as "the enemy" just for disagreeing with you. ISIS is the actual enemy. Libertarians, as much as I disagree with their economics, are not the enemy.
Saying someone isn't authentic doesn't make them the enemy. I don't think Mitt Romney is authentic, but I don't think he hates America or is trying to destroy the country. It's a matter of degree.
But even with that being said, Ayanna Pressley is not saying people who don't want to be a voice are inauthentic. She's saying simply being black isn't enough, you also have to be a voice for black people. Which makes sense. A black person isn't fighting for black rights by merely existing.
2) She defines each by skin color, religion, or sexual orientation and not their character or individual attributes. She lumps each into a bucket according to physical characteristics. That is racism
Depends what you mean by "racism." I don't think acknowledging a person's race is racist. And you can certainly fight for racial interests while still being an individual.
3) If you do not meet her standard she dismisses you or dehumanizes you. That is fascism
She wasn't dehumanizing anyone in that video. Dismissing? Maybe. She was essentially saying that if you're not going to fight for civil liberties, then we don't need you. That doesn't seem Fascist to me, though. She's not saying if you don't agree with us, you're the enemy, or you hate America, or you should go back to your country, or anything like that.
When Trump talks about people he disagrees with, he paints them as people who hate America and, if they're not white, people who should leave the country. Big difference. He even called the Democrats the "Anti-Jewish party." Which is just ridiculous, but an effort to dehumanize the opposition.