Do you think it's wrong that I'm going to purposefully start embarrassing myself in front of my mailman by catcalling girls when I'm around him so that he'll leave me alone.
Why do you want to do that to your mailman?
I don't like my mailman. He is always talking to me about his divorces affairs.
It can be annoying to have somebody who you don't want to talk to you, talk to you but you shouldn't bother others in order to stop them. It would not be nice for them to have you catcall them and it will make you look bad.
It's really not that big of a deal. I will do it regardless.
It's understandable that you want to avoid an unwanted conversation. However, you should not do so by harrassing someone else.