Yeah I thought JK Rowling being a bigoted sac of shit was fairly well known so I just assume anyone who's a fan of her works just doesn't mind her bigotry and therefore aren't really worth interacting with. But I suppose there's people who learn new things every day.
Also, Potterheads is the self applied name for the fans.
I don't think I understand what you mean by "be a centrist" on this topic.