In my experience the sort of people who would play the racism/sexism card if it wasn't the case also tend to be the people who loudly virtue signal and shame ot

In my experience the sort of people who would play the racism/sexism card if it wasn't the case also tend to be the people who loudly virtue signal and shame others on social media about those topics all the time, and even announce it in their profile/blurb next to their avatars. I think as long as you do a quick google search on someone and test their character in the interview, it shouldn't be as risky as you're worried about. I don't think the hiring all white guys scenario as a workaround as you described is very realistic. If people are actually doing that, they're missing out on the full talent pool certainly.