If another salesman comes do my door, I'm going to slam it in their face.
Why would you slam the door on them?
Because I'm a peaceful man who don't want any disturbance from other people.
It can be annoying to keep being bothered by people trying to sell you things when you are at home trying to rest. But slamming the door on their face is rude. It would be better to politely let them know you are not interested.
That and they would probably not feel as bad about it. I suppose you're right.
It's really good that you realize that. I'm sure if the shoe were on the other foot, it would feel much better for a person to just tell you they aren't interested rather than slamming the door.