That’s incredibly ableist.
I (Quentin) am autistic and bipolar. I don’t see those as “mental issues,” but I’m not neurotypical. Think of that what you will. If you think a disability negates anyone’s ideas, though, it’s you that are wrong.
w/r/t Iman, I don’t know if they are neurotypical. But it shouldn’t matter, and your use of ableism to defend racism and tell a person of color that they have “mental issues” because they speak up against racism is really really fucked up. It’s a tactic racists have used to try and villify people of color who speak up against racism pretty often, and I really resent you using it towards anyone, especially my friend.