AITJ For Refusing To Sit At The Kids Table?

So, I (25M) went to my family reunion this past weekend, and everything was going fine until it was time for dinner. My aunt was in charge of seating, and for some reason, she told me I had to sit at the kids’ table. But my little brother (21M) was allowed to sit with the adults, along with all my other cousins who were younger than me. When I asked why, she just laughed and said, “You’ve always been the fun one, the kids love you!” I told her I wasn’t a kid anymore and that I should be sitting with the adults, but she waved me off and told me not to make a big deal out of it.

At first, I thought about just going along with it to keep the peace, but the more I thought about it, the more ridiculous it felt. I mean, I have a full-time job, I pay my own bills, even have a girlfriend and yet, I was stuck at a table with a bunch of actual kids while my younger brother got to sit with the other adults? So, instead of sitting at the kids’ table, I just took my plate and went to eat outside on the patio by myself. Apparently, this upset my aunt, and my mom later told me I embarrassed her by making a scene. But I wasn’t trying to be dramatic—I just wasn’t going to be treated like a child.

Now some of my family members are saying I was being petty and should have just sucked it up for one meal, while others think it was unfair to treat me that way. I don’t know, maybe I overreacted, but I just don’t see why I should have to sit at the kids’ table when I’m literally older than half the people at the adult table. AITJ?

Edit: I sort of realize how "narcissistic" my aunt was, and this is a ongoing trait of my aunt, to be honest, this is one of the off chances she isn't full on narcissist. And, as for my father, he wasn't there at the time, he didn't even come until the time I decided to leave (at least thats what I heard from my brother)