That's the problem with personality disorders - we call them "disorders", but they're also fundamentally a part of someone's "personality", i.e. relatively unch

That's the problem with personality disorders - we call them "disorders", but they're also fundamentally a part of someone's "personality", i.e. relatively unchangeable behavioral characteristics. It's hard to draw a clear line between "insufferable asshole" and "borderline/narcissistic/histrionic personality disorder".