Pregnant + stepson = anger

I cant take it! Every weekend im ready to get in my car and just leave my house. I shouldnt feel like this in my own home! My stepkid is 10 and ignorant as hell. Leaves his stuff every where. Talks back. Rude. No manners. Ungreatful. Horrible, horrible child. We cant even go anywhere with him over the weekend because he will climb shelves in the store, eat non-finger foods with his hands in restaurants, chews on everything, and does not listen at all. He pitches fits when he cant have ice cream for dinner, throwing himself on the couch literally crying, saying he cant have it cause hes not real family. He yells at me that he doesnt want to come here cause he has to do chores and has a time limit for his tablet. Idc if he doesnt come here! He waits for me to get in the tub or shower and pounds on the door until i cant take it, spazz, and get out of the bathroom....cause he "has to poop" and never goes in after i get out. He refuses to eat what i cook cause i "poison" him. Aaaaaaaand of course, hubby ignores the behavior because he doesnt want to seem like he is picking me over his bad ass annoying kid.. i cant take it anymore! Im ready to stay at my parents (1000 miles away) for the next 6.5 months