When there are such instances, there are certain ways I can suggest to handle it.

1) Stop playing CF for a bit until you've cooled down over it. Not my favorite option but it is one.
2) Roll a char that is designed to beat the ever living hell out of that guy. I'd say no to this one always, cause once you are done you have a pretty useless character, so why waste the time.
3) Roll a char build that you always wanted to try or one you already like to play, with a good role. That tends to get you back into the fun aspects of CF quicker than anything. And should you see the guy, and its RP acceptable, beat the piss out of him.
4) Roll a neutral neutral herald (align/ethos brings PK a bit more into it), and play CF apart from a large part of the PK aspect just for the more RP driven part of the game. Sit back and just watch stuff and have fun.
5) Man up, realize shady annoying things are going to happen, but that jackasses aren't going to ruin it for you, and keep on rolling along. Never understood rage deletes. I did do it once, but I took it back almost immediately and played another 250 or so hours with that char which was a blast that I would have otherwise missed out on.

I like a combination of 3 and 5, specially for a good player like you that brings some good interactions to the game. Fact is, in my CF time right now I am seeing some of the best RP I ever have, even with lower player counts I find no shortage of stuff going on. Seen some really great fights, and a lot of classy behavior from players that get the short end sometimes. Are there a-holes playing? Hell yes. Are more than 5% playing those type of players? Probably not.