My parents threw a party for my brother’s promotion meanwhile I got my masters 3 months ago and not even card..

So my (28F) brother (32M) just got a promotion at his job and my parents threw him this huge dinner party last weekend. Like they invited aunts, uncles, cousins, the whole deal. Which is great, I'm happy for him honestly.

But here's the thing, I graduated with my masters degree 3 months ago and they didn't do anything. Not even a card. When I brought it up to my mom before the party she said "well you knew you were going to graduate, his promotion was a surprise." What kind of logic is that??

So at the dinner I might of been a little quiet and left early. My brother pulled me aside and asked what my problem was and I told him straight up that its not fair how they treat his accomplishments vs mine. He got super defensive and said I was being jealous and making his night about me.

Now my whole family is texting me saying I ruined the celebration and that I need to apologize. My dad even said I'm being "petty and immature." But like, am I wrong for feeling hurt? My boyfriend thinks I should've just sucked it up for one night but I dont think I should have to pretend everything's fine when theres clearly favoritism going on.

AITJ for calling out the double standard at my brothers party?

TL;DR: Parents threw my brother a huge party for his promotion but did nothing for my masters graduation. Called it out at his party and now everyone says I ruined it.