u/Content-Sherbet-4700

I just got into this argument yesterday and it's been really bothering me because I'm not sure if I'm in the wrong or not. So I came here, aha.

So the girl (20F) I (20F) room with is quite overweight, definitely over 300lbs at 5'6". This is only relevant because she's very active in body positivity circles and even organised a small fat activism group at the college we both attend. We've been rooming for about 3 months now after my previous roommate moved back home, but I've been making efforts to be better friends.

She's educated me a lot over the discrimination people in larger bodies face over the time we have roomed together, things I had no idea about as a person who has always been naturally slim. For example about how fat people will get shamed for eating foods no one blinks an eye at a thin person eating simply because they are fat. It's something she's clearly passionate about so I've always politely listened. Anyway, personally I am someone who is really active. I've always loved martial arts, going on jogs and swimming and usually go for a run before or after college.

So yesterday after college, I had changed into my running clothes in the changing rooms and was about to go for my jog when I saw my roommate with a few friends about to head home. She saw me in my gear, turned to her friends and said "Oh that's my roommate, she goes running almost every.single.day. She's always going on about how much she loves running" and rolled her eyes to her giggling friends. So I basically said "Hey, maybe if you tried running one time you'd realise that it's super fun and actually helps a lot with energy and mood! Maybe we could go jogging together sometime and you can see for yourself."

At that point the laughter stopped and she said "are you trying to say that I haven't tried running just because I'm fat?" To which I had no real answer so I just said that well I'd never seen her go running and she said that she runs on the treadmill in the college gym 2 days a week and that I'm trying to stereotype her as a lazy inactive fat person and that my fatphobia is showing. At that point I was feeling antagonised by the whole group of 4 people so I just left with my cheeks flushed. Apparently my roommate told her whole group about the interaction as an example of subtle ways fatphobia can manifest and today I got dirty looks from her friends arriving into school

AITA?