Am I the bad guy here?!? Overreacting?

I’ve been with my partner for 3 years, he’s 27 (just for reference lol) anyways..about 6 months into our relationship he developed a “baby” voice… like he talks in this baby voice now 24/7 almost, AND on top of it, he pronounces things like a toddler almost… just incorrect sounds and trying to be “cute” ? Idk..anyways I would always brush over it but it’s driving me literally insane. Baby voice every single second of the day. Am I wrong for being turned off by this and just over it??? How do I get this to stop 🫠

This is not him being silly trying to get me to laugh, this is almost all day long, about anything.

He wasn’t always like this otherwise I would of said no go. Do I get this to stop, or is this just him now?