In case the term was new to anyone else, "PDA" here is obviously neither "public displays of affection" nor "personal digital assistant", it is:
en.wikipedia.org/wiki/Patholog…
It is characterized among other things by e.g. "a greater-than-typical refusal to comply with requests or expectations, as well as extreme efforts to avoid social demands".
Thank you @Retepkce for bringing it up!