> Likewise in ADHD, you tend to find a lot of social rejection due to impulsive behaviours that alienate people.. so you get a comorbid BPD-ish quality where you're aware of the social validation available, but are constantly fighting your own impulsive undermining of receiving it.

ADHD (or maybe autism?) isn't about social rejection, it's about the opposite. Sometimes people will try to reject you/put you down ("haha, you wear glasses, four-eyes"), but you don't understand the intention ("yes, this is accurate") and are just puzzled that someone would say a fact out of the blue.

Correspondingly, you might mention a fact "these jeans make your ass look fat" without meaning any judgement, and the person will take it as a rejection. That's why this is hard to navigate, not because people reject you initially.