I'm going to have to agree with you on this. I have one relative who has "bpd" and she turns it off and on like a light switch as justification for her asshole tendencies.

Me and the Mrs. see it but her immediate family have bought it hook, line and sinker.

When a lame family event is happening her bpd is "on" and she stays in her room. We are told the stress of all the people make her anxious and she will just be a a bad mood. But an hour in and we hear her laughing her ass off talking with her friends on the phone in her room. Okay... it's bpd right?

Next weekend her friends having her rehearsal dinner for her wedding, 50+ people and this asshole is fine, chatting up everyone and giving speeches.... SUCH BULLSHIT. She totally uses it to ditch shit she doesn't want to do and her family totally goes along for the ride.