MIL issues

I'm currently 24 weeks pregnant and living with my boyfriend and his mom, and she is so disrespectful. She tells me I'm lazy, screams at my boyfriend and tells him he picked a bad woman, and that he was stupid the day he met me, all while I'm standing in the room. I got a little upset because my boyfriend didnt stand up for me at all, he just laughed. Is this how it should be? What would you do? Advice? Thanks! 🤗