Let’s not say that reverse racism is a real thing, because that’s an imaginary racist trope.

My view is that racism can happen to any ethnicity: black, brown, white, anybody. It depends on the situation. If a business run entirely by white people disallows entry to a black person because they’re black, that’s racist, but if the races were reversed (a business run entirely by black people disallows entry to a white person because they’re white), I’d say that’s also racist. In fact if I end up talking to a white person about racism I might deliberately give them an example of a situation where a white person could experience racial discrimination, because that might make them think “fair point, I would dislike it if someone was racist to me, so maybe racism is a bad thing”.