SO's family rant

I wish we lived far away from them. I don't see them often but they irritate me. I kind of got into an argument with my SIL around a month ago. My SO didn't tell her anything because he couldn't really hear that we got into one since there was loud music. He did say he was going to tell her to not get into our business in person but he hasn't seen her since. So whatever , today his uncle called him. And asked him what he ate and he said " jack in the box " the uncle was like tell her to cook for you! ( we sometimes eat fast food for dinner because I'm still learning to cook! I was never taught growing up, so I'm now learning ! We don't eat out everyday either... but even if we did it's not his business ) after , I guess his uncle noticed him drinking and said " why don't you drink with me , why do you take your gf if she cant drive you.. " my SO just laughed . Like I don't see what's funny , it's quite annoying to be honest . I'm irritated by him because he never has my back but when it comes to my family I ALWAYS have his back. Any advice ?