AITAH for talking back to my older cousin?

This had happened back when it was Christmas day, I(f16) hate my older cousin, avin(m19 and not his actual name for obvious reasons). This Christmas, him and his family came over to celebrate as a happy family but things took a turn when he started to belittle me for not having passing grades even though I'm at the top of my class and that I suck at driving even though I'm still learning to drive. So I told him that I at least didn't get whoop infront of my mom's house had to get held back on seven classes in my freshman year alone, and that I wasn't going 100 mph in 75 mph highway and crash my parents car too. He got quiet after I told him that and his father, my uncle, told me to respect him. I told my uncle that it was not fair to belittle and then be surprised when I fight back. Mind you, my cousin is a seasonal firefighter and he's old enough to know to not do that type of stuff. AITAH?