In laws not liking you

So I’ve come to the conclusion that I really think my sister in law and mother in law mainly don’t like me, because they think I’m too “boujie” I found out they were talking so much crap about my boyfriend and I and how we dress and what we buy and how we’re always looking nice anywhere we go. I really don’t understand how people can be like this. Both of us are the most humblest people you can meet and we definitely love helping others any chance we get. They both are against me and are now BFFs with his sons mom, which before they couldn’t stand and would also talk shit 😂 I’m currently pregnant so it does rub me the wrong way. But what do you guys do if you know your in laws don’t like you?