Somewhere on the news it said that ching chong was some kind of bad Chinese slang, of which I'm sure Rosie had no idea. If ching chong is something vulgar or nasty in Chinese, then yeah, people are going to be offended.
If anyone even tried to put their hand near my face, I would probably bite them.
Seriously though, I have a thing about germs. I don't like doorknobs. And putting your hand over the mouth of someone who is not your child or spouse is rude.