You've never encountered someone who is pretty autistic and doesn't care about (or perhaps understand) the social consequences of using slurs?

Or someone bipolar who gets kind of erratic and can say really out of character stuff when they are going through a manic episode?

Or someone with tourettes that might say something that pops in their head unexpectedly?

Sure thing about ADHD. You're right that people with the executive function disorder don't tend to blurt wild social faux pas. But there are also people with social function disorders who might.

It doesn't necessarily mean they are terrible people