Can't stand my MIL! 😡

My husband's mother, after having been absent during a large portion of his life and living in another state our first few years of marriage, moved in with his grandparents--15 mins from us--in December. Since then, it seems like it's been nothing but drama. Her alcoholic boyfriend has made sexual comments, while drunk, to me in front of my husband (which caused everyone to be uncomfortable and resulted in us leaving after visiting a few hours), his mom has told my hubby she feels as if I don't like her and we treat MY parents in a more special manner (not true) than we do her, she has offered OUR home to his sister and trashy boyfriend while they're visiting, etc.