I posted this in the same topic in Road ...
Imagine you are walking alone along a sidewalk. All of a sudden someone comes around a corner and starts walking directly behind you. So close they could reach out and give you a hug from behind.
That's how many of us feel when someone drafts us uninvited.
Also, there's a certain responsibility that is suddenly placed upon the rider who is just out for a nice, quiet solo ride ... to point out potholes, to indicate a speed change, to sit still and not suddenly stand up and stretch, and to not spit and fart. It's an imposition.