AITA for calling out my best friend’s girlfriend

A few of my closest friends and I went on a trip, and one of them brought his girlfriend along. I had met her before, and she seemed fun. However, at the very start of the trip, they had a fight over something that, IN MY OPINION, was quite trivial. They ended up bickering throughout the trip, which made things uncomfortable for everyone. My friend was completely occupied with her, and it felt like their issues affected the whole group’s vibe.

After the trip, I vented to another friend from the same trip about how their constant fighting had kind of ruined the experience for the rest of us. Unfortunately, that friend went and told her everything I said. Now, she hates me and is pressuring my best friend to choose between her and me.