It's the tactic I'm afraid, we saw it with George Floyd and BLM.
You can't really argue against racism, but you can try to discredit the message. So if the person highlighting the issue isn't absolutely angelic, you can pick something out and justify racism it in the minds of the morons. And working on the principle that human beings aren't perfect and make mistakes, you can pretty much make your case for your audience.
As I said earlier when the tweet became public, the thread took a depressing but predictable turn.