Aita For For Moving Away From My "Friend" At The Cinema?

Hi, so I have this friend (let's call her Brittany) and she is incredibly self centered. She is also really sensitive - when someone who isn't her parents, friends or teachers, says her name, she bursts out crying. She's Part of the LGBT community (and I have absolutely nothing against it) but she just talks about it all the time, she thinks everyone is attacking her and if one or someone else from our friend group says anything jokingly like "you always get to class on-time" she takes it as an attack. In fact, we said just that to her a couple weeks back and she literally pushed me into a puddle! She then went to the teachers crying and said that we were being mean to her and bullying her and WE got in trouble for it. Everyone thinks she is most precious thing in the world. Brittany has a complete disregard for everyone else like when I mentioned how people at school keep throwing my pens everywhere, she told me that at least I'm not constantly being targeted for being LGBT. Also she always spits everywhere - when she talks, when she laughs and especially when she eats. I've wasted at least half my lunch on countless occasions because her germs have flown onto it.

But anyway, onto the actual story. So I went to watch the Barbie movie for the third time last week. When Brittany wasn't there, I asked my friends if they wanted to come too. They were excited and wanted to come. I didn't realise that Brittany was coming back and she overheard. She said that she would come too. I didn't ask her, she sort of invited herself, which annoyed me. Later that evening, on our group chat, we discussing seats and everything. Brittany asked if I could buy her ticket and she'll pay back in cash since her internet is down. I said sure but how come she is texting us if her internet is down. She didn't respond.

We went to the cinema and everything was fine. We for popcorn and found out seats. There was no one else in the cinema and we expected that since we picked a time in the middle of the day (we had an off school day). So the movie starts and I happen to be seated next to Brittany. She hadn't seen the movie before but the rest of us have all gone together. The movie starts and Brittany is tapping me every five seconds just so I can look at her facial expressions as she is watching she doesn't even look at me or say anything, she just wants me to see how she is finding it. This was extremely annoying.

We eat our popcorn and she then starts tapping me and whispering stuff like " oh I've seen him in this movie and she was blah blah blah" or whatever some nonsense stuff that I honestly did not want o know or care about right then. But as she speaks, popcorn and spit flies out of her mouth. Into my hair when she leans towards me, onto my face and arm and worst of all - into my popcorn. I hadn't even eaten a third of it. That was pretty much the last straw. I made eye contact with my actual friends, who had all seen what had happened. We made an agreement with our eyes. Pretty much simultaneously, we all said, "we need the loo" and Brittany tried to come too but we said she should watch the movie and we'd be back in a bit. Since we were at the back, Brittany couldn't see that we had all just taken out stuff and walked down to the bottom row, which had the best view of the screen and premium seats. I couldn't eat my popcorn but my friends let me share theirs. We sat there for the remainder of the film.

When we came out of the cinema, Brittany found us and yelled at us for deserting her. I told her we didn't, whenever even left the room. And she, spitting as usual, screamed that we are terrible friends and we are not invited to her birthday anymore. She didn't know that none of us were even going. But I guess now it's gonna stay that way.

But I'm now thinking that maybe it was little bit mean. AITA?