Husband and parent problem

I need some advice, science I’m pregnant I’m trying not let this effect me emotionally, but let’s be real pregnancy hormones exaggerate EVERYTHING. Anyways a little back story on my husband first. His parents are divorced, his dad is a controlling, manipulative, POS. His mother has 5 kids total, 4 from ex and 1 with current husband. She doesn’t really care about her children and their feelings and is quick to blow them off and act like they don’t exist. So my husband obviously didn’t have the best child hood and upbringing. Because of his parents and family he has severe anxiety. I on the other hand had an amazing childhood and loving parents. We went up to visit my parents and some of my friends this past weekend and everything was great until me and my friends went bridesmaid dress shopping. My husband stayed back with my parents and went to Lowe’s with them, that’s when shit hit the fan. My husband forgot to take his meds and was already on edge, he saw a car that was triple parked and decided to write dick on the window in the dirt. Childish and immature.... I’m fully aware. My dad apparently told him not to and got mad when he did, obviously. Now my husband refuses to see my parents or even talk to them about ANYTHING. They’re supposed to be coming down either this weekend or next to come visit us and my husband said he was just gonna be “salty” and not talk to them. I told him he needs to be the bigger person and just get over it and move on but he doesn’t seem to want to. Our marriage is great and perfectly fine, we’ve always talked out our problems with each other and have never gotten into an argument or screaming match. But for what ever reason he can’t just let this one go. Part of me is wondering if he is subconsciously upset about how my parents are compared to his and he doesn’t realize it and that’s why it’s hard for him to get over this. Any advice? Words of wisdom? What you think may be going on??