Eh, there's plenty of people that are more of a homebody or like hedgehogs. They like the comfiness of their home. And the quietness. I also rather stay at home or go to a museum before walking into a bar. We all just have different tastes.
As for my mother. She is angry and these two haven't apologized. Basically after their father(my grandfather) died half of his children went a bit nuts. He said please don't quarrel amongst each other after I'm gone. Welp, they did it anyways. My paternal family side has their own trauma and the children just can't accept that they may be better off taking some therapy. Their grandfather was a monster. And since it's a farmers family that means a big house with many children and the grandparents under one roof. Needless to say pretty much anyone hated my great-grandfather. All these old family issues from my grandmother's and grandfather's side resurfaced with the death of my grandpa. Generational trauma and unresolved issues are a pain in the butt.
So... I don't know what's up with the family of your Ex, but maybe it's better not getting roped in. I just hope for you that his family won't turn into rats and being all two-faced depending with whom they are talking to. Slander is ugly and destructive. That's just the worst-case scenario I'm painting here. Maybe they are verbally tearing him a new one right now, because he went "whatever" on his (ex)wife.
Either way, and it may sounds callous and weird talking like over the internet, but "whatever" is not good enough. I asked my mother if I did the right think to share my opinion with you. She said that you are very brave and strong and "Thank god they don't have children. That would have made it so much worse and so much harder and scarier for her." My mother was the poor sob that had children with a man who didn't know that he was depressed and didn't wanted couple therapy for the sake of the marriage. Ended in an ugly marriage and a divorce. Whatever is not acceptable. I'm glad that you are away from him.