Rejection sensitivity dysphoria is an acknowledged trait of ADHD.

I can't respond to your newest comment but essentially 'rejection sensitivity dysphoria' is not in the DSM-V, so to acknowledge it one needs to have both a definition and some reasonable experience with the diagnostic entity (i.e., it's not enough to read about a disease to be able to diagnose it).

That doesn't invalidate the parent's point. We can still question if the details and way it is presented is accurate.