I feel like to some degree the plan to buy out twitter (and turn it into "elon musk's x") was in part a plan to split up one of the only websites on the whole internet where black and white users successfully integrated. (however, to suggest elon had any kind of plan might be ascribing too much intelligence to him)
all this to say: you can see how the integration of twitter lead to the way that there was so much white support for the BLM cause in 2020. the white users weren't hearing about it second hand- they were hearing about it first hand, it was directly affecting the black people they followed. this clearly pissed off a lot of powerful people who were angry their white kids were marching with the black kids, and so they schemed to split everybody up again
and when I say twitter was "integrated" it wasn't just a matter of who you followed- it was omnipresent. in retweets, trends etc, you would see everyone. Black Twitter was probably the most influential group on that whole site in terms of the memes, for example
I can tell that ever since musk bought the site he's tried hard to sow racist misinfo aimed at his white fanbase in order to turn "X" into a white-dominated website, and it seems to be working, but unfortunately, a lot of the twitter clones ended up leaning white as well- I'm sometimes asking myself "where did everybody go"- because twitter, nowadays, seems empty as well