Yesterday my roommate brought home a bunch of tasty food for dinner and asked me to see if anyone wanted to come over and help us eat it. I hit up my bestie who enthusiastically agreed and offered to bring sodas. This person is not a huge fan of my roommate (who can be a bit too boisterous for her) but we usually all get along just fine. Bestie seemed like she was in a good mood and all was well.

We had dinner and then proceeded to get into watching a movie and putting up some Halloween decor. My roommate was on his absolute best behavior, just watching us decorate and watching the movie. Sometimes he gets a little touchy with people but he wasn't even doing that today. No being loud, no touching (outside of a fist bump that he thanked her with for helping), and no shenanigans.

This is when the first outburst happened. She kinda snapped on him for just sitting there and chilling with us. It was pretty rude, but I didn't say anything this time. He left us alone and we finished decorating, so I went and got my roommate to see all the work we had done. He was super stoked and thanked us both, which bestie just ignored.

Now it was time to play cards. We play cards in a 3 season porch that is also used as a smoking area. Bestie and I start our game and roommate comes out to smoke. Again, he's well behaved and not being particularly obnoxious or even really talking much... and bestie just starts yelling at him that she can't deal with him right now and all this.

That's when I'd had it. I told her "This is not your house. You do not get to dictate where the people who live here spend their time and neither do I. I'm sorry you don't like him but you are a guest in both of our home and you do not get to yell at my roommate for simply existing in his own space. If you can't handle that you can go."

She freaked out and left, making me feel like I could've been an asshole in this situation.

AITA?

Edited for some clarity and punctuation.