AITA for “making fun” of my baby cousin

Okay so first of all im 14 years old, so im pretty sure im gonna get a lot of “you’re just a teen” but im really hoping you guys can see my point<br><br>I have a one year old cousin named Leo and EVERYONE in my family fawns over him. Like yes, he’s cute and all, but why is it such a big deal? Even if he does something stupid, he gets a ton of praise for it. Like the other day he said “mama” and everyone was like “oh my god he said mama, hes so smart! He’s such a genius!” But like bruh he’s ONE. It’s expected. My cousin is not a prodigy or anything, and I just hate how everyone dotes on him so much.<br><br>So im just over here like “yeah ok whatever sure hes smart” and my cousin came up to me and was like “Hi! Hi! Can we play?” And I was like “yeah sure I guess” and he just looked at me and went “wowww” and I deadass thought he was just saying random words. He just kept looking and going “wowww, you look prettyyy” and I was like “okay? Thanks” and my mom and aunts and stuff were like “LEO YOU ARE SO SMART AND FLIRTY AND SUCH A LADY’S MAN! HES GONNA BE SUCH A PLAYER WHEN HE GETS OLDER” and I was just like “yeah its ok I guess he’s just a baby” and my mom got mad at me and took me aside and was like “Im very disappointed in you. You need to be nice to your little cousin and not make fun of him” and I was like “what? Im not making fun of him” and she was like “well dont act so bored with him when hes trying to play with you. Hes just a little baby and he looks up to you and wants to play with you. Hes probably hurt that you dont want to play with him” and I was like “no im playing with him, I just dont want to act like hes doing something groundbreaking and amazing every time he does something” and she was like “well just do it anyways, you need to be nice to him and make him feel good and stop being such a bratty teen, you’re not special just because youre the only girl and the oldest” and I was like “but I dont want to just say nice things and be fake” and she was like “the most important thing is for Leo to feel happy and good about himself. You need to do what will make him happy even if you dont want to. Youre being very mean and selfish and you need to stop” and I was like “but I dont want to be fake and tell him hes amazing just because hes cute” and she was just like “shut up and dont be a brat” <br><br>I went back to playing with Leo and hes just doing random baby stuff and my mom and aunts and stuff were all gushing over him again and im just like “yeah whatever he can talk and walk. Ok.” <br><br>So later tonight my mom scolded me some more and said that all the family is talking about how bratty and mean I am to Leo and how im ruining everything by being so cold and distant and stuff. And she was like “all were asking you to do is be nice to your cousin and stop being so such an asshole. This is your fault for being mean and selfish” <br><br>AITA for acting like my baby cousin is a normal baby and not a genius prodigy? Or should I just be more in the moment and try harder to make him feel good even if it feels fake?