How to get along with in-laws...😬🙄

I love my SO to death. But his family dynamic drives me CRAZY. I come from a really polite, on the quieter side (maybe a little New England-type repressed but never mean or rude) family. All his family does is yell at each other. Like scream. I guess it's a cultural difference? I just don't know how to handle it when they're in the middle of a fucking screaming match (seriously no one listens to each other) and I'm just sitting there trying to be a good girl.

ANYONE else had a challenge like this?