What’s So Funny?
It’s always preferable to give someone a soft landing, to let them know they’re a wonderful person, but you just can’t relate. Breakups are tough enough as it is; why make things more difficult by being unpleasant or brutally honest? Be as pleasant as possible. Alternatively, you might be like this woman and find the concept so amusing that you can’t help but laugh out loud.
There’s no “correct” way to reject someone, but there does have to be a better option than mocking their appearance. She couldn’t even stop laughing to apologize and honestly refused him politely. Was it really that amusing? Or was she just awkward giggling, hoping he’d depart soon? I suppose we’ll never know.