I'm still learning about contesting, very far from being good at it! but, I'm having fun.
It's fun and a challenge for me to scroll up and down the band, and pick 'em off, the QRM and pile ups just add to the challenge, which also keeps it interesting - sometimes a bit frustrating. When it seems I've worked everyone around the band, IF I can find an opening, I'll park... and start calling CQ. I'm not picky, some of the folks seem to have these "mechanical" sounding callers - eh, who cares, why discriminate - I try to treat everyone alike, and nicely, as I'd want to be treated. While I've never tried to deliberately piss someone off, I'm sure I have (unintentionally).
Late yesterday, while working the PA QSO party, I heard some guy trying to hassle me while I was working the end of the contest. No, it didn't bother me, neither does the intentional QRM, it's just part of contesting - it could be a next-door neighbor's dishwasher that adds to the challenge.
When I hear some guy parked on a frequency, giving his version of "how to make a QSO... his way.." - eh, why not take it in stride, do it his/her way, get the contact and move on. If I'm parked on a frequency, calling CQ - I'll take everyone, and try to make point of thanking them for the effort - DUPE or not. During the PA QSO party, I got several calls I couldn't log - so I gave them a signal report, a quick description (well above the noise, good audio, at the noise level, nice signal, etc.) - and thank them for letting me know I'm being heard out there.
In the end, 6% of my contacts were made while parked on a frequency... the last 2hrs of the contest. I like "hunt and pounce", "seek and log", or whatever you want to call it.
Bill