If I want to go to a specific place ( a specific trail, peak, fishing spot, whatever), I can't begrudge anyone I come across there even if it is crowded. I made the choice to go to a popular spot.
If I want to be alone in the woods, I go where I am unlikely to run into others. I choose lightly used trails and/or bushwack.
If I do come across someone, I treat them with respect and always greet them with a hello or a wave, the same way you do when driving on a backroad 10 miles from the nearest blacktop. You never know when you may need the assistance of a fellow woodland traveler.
That doesn't mean that I am not somewhat (or even very) annoyed by that person's... presence. But they have no less right than I do to be there, and we are there for much the same reason no matter how I judge him by his gear or attitude.
I have gotten the 'look' from other hikers -all the time- that silently says, 'You a-hole, I came here for the solitude.' Yeah, you and me both buddy, I think as I greet him with a smile and a wave.
When I get that look on a really popular trail, I can only shake my head though. Trails are civilization. You can take almost any maintained hiking trail in North America to a road that will lead you to the Empire State Building.