Angry Dinner Host. HELP?

My boyfriend and I were just attending a Christmas party of two of his closest friends who recently wed. I have been over there many times. I really like the husband, and him and I get along rather well- However regardless to how polite I am, or how hard I try to be likable, the wife snips at me, puts me down, told me she'd kick me out/light me on fire if I continued fidgeting/playing/slurping! She's very on edge but, you know, gotta respect it.

Tonight was no exception. She's always treated my boyfriend very grabbily- and when I make motions of public affection towards him she scowls. Tonight, we were leaving a little bit on the early side and she started crying when she hugged my boyfriend good-bye.

Not gonna lie, this really weirds me out.

What do you thinks, Y/A?