You know, I’ve been thinking about the way Jay grew up, and I think it explains a lot about how he interacts with the other characters and the character flaws he has. Being in the junkyard, he probably didn’t have many chances to interact with kids his age or even adults unless someone dropped in to buy something. Assuming he went to school, he would probably have suffered from bullying(based on how much he is embarrassed about his parents job) so his issues with connection and monitoring his reaction to other people and intense situations(especially in the earlier seasons) makes a lot of sense. He isn’t accustomed to being around people in general, and hadn’t developed the necessary intuition that groups need to communicate properly.