She never really mentioned BLM, it was moreso targeted towards cancel culture imo. And she didn't even type anything out, she really just shared an image. Its equivalent to 90% of the posts on r/forwardsfromgandma. Plus, "Comparing to Nazis" in this case means that she said that opposing free speech, judging people by skin color, and trying to rewrite history are literal totalitarian tactics, the Nazis are simply the most infamous totalitarians in recent history, which is why she choose them.