Mother in law rant

We moved in with her a week ago. She was acting super nice and everything but the past two days she has been putting me down and my SO always tells me just to bear with it. I understand doing things her way in her house. I do. But the fact that I have to pretend to be perfect is ridiculous. She has been saying rude things about everything I choose. Especially my baby names. They are odd. But they're not bad. I'm just very stressed