The issue of inherited trauma is interesting because EJ seemed to be positing that Alison's trauma of losing a son was passed on genetically to Joanie. Clearly our own early life experiences affect us which if different than the argument posed. Joanie was impacted by the belief that her mother was mentally ill and committed suicide. she was further impacted by her father's reactions to this, Alison having left her with Cole and Luisa when she sought help, early years with Noah who she then did not see, Cole and Luisa breaking up, etc. So Joanie had many traumatic events in her early years. Do I think she inherited some genetic change that happened to Alison based on her trauma? Nope. But Joanie did have a messed up early life. Doesn't explain the perma-scowl but it does explain her problems getting close to her children, coldness in interactions, fear over becoming the same age Alison was when she died, etc.
As for the Solloways, I would expect the kids to be impacted by their parents divorce. It is part of their childhood. Each child was a different age and had a different level of impact. However that impact is also based on who they each were as people when this happened. For Whitney, she seems to not trust in relationships. At the same time, we were never given a positive view of Whitney so it's hard to say what impact was from the affair/divorce and what is just Whit at her whiny, entitled best.
But yeah, hanging out in a cold parking lot eating cake and drinking champagne while your parents boff is very odd behavior. That's a visual I could have done without.