I can imagine being a wizard. That doesn't mean I'm a wizard. In fact, in a game I was playing just a few minutes ago I was a wizard. I was female. I wasn't human. I was extremely skilled in sword fighting. Games aren't reality. The freedom of gaming is of course why group identity advocates (especially biological group identity advocates) are objecting. They hate the idea of people not being restricted to the biological group identities they make up and the stereotypes they attach to those identities and they hate the idea of people interacting without those identities because they don't exist in the gameworld (or don't have to reflect reality if they do).
There are aspects of culture that are more challenging to people who have pretty much any biological trait if they make it known, due to biological group identity politics. These people are therefore part of the problem, since they promote biological group politics and the irrational prejudice and discrimination that goes with it. Would you be as "empathetic" to a group that existed for the purpose of being for white male gamers only? There are, of course, aspects of gaming culture (and culture in general) that might be more challenging if you are both male and "white". Or if you have a particular accent. Or if you have blond hair. Or whatever.
I wonder how much of the challenge these people face is due to being "black" women and how much is due to being biological group identity politicians who promote racism and sexism. I also wonder how much of the challenge they face is real and how much is in their own imagination. I also wonder how much is the same as anyone might get when gaming online. Someone being unpleasant to you doesn't necessarily mean they're being unpleasant to you because of your sex and "race", especially when they don't know either of those things. People who believe in biological group identity consider such things as being of such paramount importance that they are a person's identity, but not everyone is that irrationally prejudiced.