Exactly. I'm allowed to get angry when not only is the ONLY REPRESENTATION WE EVER HAVE in mainstream media is horror movie/game villains, and not just that but shitty characters who haven't even been properly researched to be accurate.
It hurts and it's frustrating. It's easy to google some shit and double check your sources. If I'm writing a horror movie or game does that give me a free pass to be racist? No. It shouldn't give you a free pass to be ableist and stereotype the mentally ill in a harmful way.