He wouldn't swear, he'd just give a disapproving look, which would hurt even more.

>Cannot legally say fuck
>Tails Doll
Yeah, but only because if it was capable of speaking, the noises it would make would drive a man insane and saying fuck would be a mercy compared to the guttural assault that would penetrate your psyche as is sung a cacophony of sanctity defying sounds that defy what humans can define as "painful".

That or it's a caricature of a character and has only appeared in one game ever, and all this creepypasta nonsense is a bit overdone.