AITA for making a big deal out of my sister making a joke out of my ED?

This is a bit of a throwaway as I don't want my family members seeing this on my main if they decide to browse Reddit. It's also a rehearsed post as I can't post from my phone so excuse the length.<br><br>I'm a 20 year old male with crohn's disease. I'm also very underweight and have been diagnosed with arfid, which can function a lot like an eating disorder. Suffice to say it's been hard to gain weight for me.<br><br>So obviously food is a big thing for me, and I can't stand people making remarks on my eating habits.<br><br>So my family was going to go to a chain diner for some food. As I was getting ready my sister kept pulling out foods she thought I would like from the fridge and saying things like "Oh you'll probably like this" or "Could you eat this?". Now, I know she was just trying to be nice, but I just don't like people trying to get me to eat. It's the same reason why I hate diet culture, it's just very invalidating to my condition and i feel judged for not meeting unrealistic beauty standards.<br><br>But I digress, as we're all in the car my sister says "Oh yeah, I'm definitely not getting dessert" in this really obnoxious tone.<br><br>She's talking about me, because I always get dessert at diners as I can always tolerate sugars but I get full really easily.<br><br>At this point I'm just fed up, so I tell her to be up with that shit and that it's not funny to make jokes about peoples disorders and eating habits.<br><br>She just goes straight to my parents on this and they tell me I was being a dick and that I need to get over myself.<br><br>I just think that if I was in her position I wouldn't make jokes about her conditions. So AITA?