We've already established that Ariel had to sacrifice her voice in order to become a human in 'The Little Mermaid.' We don't know if Ursula was trying to soften that blow with some of her advice, but it wasn't helpful.
If Ursula is to be believed, human men will like the fact that Ariel can't talk, because they 'don't like a lot of blabber' from their women. That'll be Disney telling a generation of young girls to keep their mouths shut if they want to find a man, then.