Help! I don’t want my MIL to come stay at our house

I basically don’t have a relationship with her because she’s been very mean to me. At one point, I decided I didn’t want anything to do with her anymore. Luckily, my husband and I live in a different country than she does so it’s not like we have a lot of opportunities to meet anyway. Now I’m away on a trip for a few months and my husband is alone at home. And he just told me that she and her husband (my father in law, who I have no problem with) had already bought airplane tickets and basically invited themselves to come stay at our house with my husband. I told him I’m not okay with this. He knew this and we always agreed that his mother coming to stay at our house would be crossing my boundary. But he just argued that he didn’t invite them, and he didn’t have a choice but to let them stay. He also said it should be fine since I’m not there and won’t have to meet her. I insisted that I’m not okay with this. I don’t want her to stay at our house becoz I consider it invading my privacy and also if she can’t treat me right, she shouldn’t take advantage of me. My husband keeps saying it’s his parents and he has the right to welcome them to our house and that I just had to deal with it. He said I was forcing him to be an ungrateful son and I was being a bad role model for our (2 year old) son and when he grows up, he’s going to treat me like how I force him to treat his mom. I feel very hurt by his comment and overall attitude. He suddenly changed his mind and attacked my integrity just because he can’t say no? What would you do if you were me?