Throwaway bc reasons

I know the title sounds bad but hear me out, Me(23m) and my fiance(26f) were at home. I was with our 5 month old and she was catching up on shows. She came back past the doorway and the baby saw her and starting to yell and cry for her.

I, in a friendly tone btw Said “fuck you you stupid baby”

However I said it in the nicest way possible and babies can’t understand people so it should have been fine. However she overheard me and blew up my phone saying I shouldn’t use that vocabulary while with a baby, and if the baby is stupid maybe i shouldn’t be taking care of it.

I just brushed it off but its the next day and she hasn’t even acknowledged my existence so I think I might be an asshole