I want to scream at a man doing a hard sell
What did he do to deserve this kind of yelling?
He has been going on for more than 5 mins
You are fine to just let the person know that you are not interested. They are simply trying to do their job to sell the product.
It's not my problem, I've already heard enough.
I get that salesmen can be super pushy, but it's just a part of their job and I believe it would be better to try to see how he sells. Wouldn't it be impressive to learn how to be that charismatic? It would be hard to get mad at that!