Saying something discriminatory of any mental illness. First off I wouldn’t ever want to be around someone who’s willing to hurt my friends. Second off a person who’s discriminatory towards any mental illness would most likely hate me for some of my PTSD symptoms too.
For example, someone who believes the lie that all people with NPD are abusers raises the alarm of ‘I am a dangerous and unsafe person! Don’t reveal yourself or I will hurt you too!’ Doesn’t matter that I don’t have NPD. There’s no reason they wouldn’t be dangerous me too, and they’re dangerous to people I care about anyways