Personally I hate statue scopers and crouch heros. Especially those dudes that are head glitched so hard you can only see the hair on their helmet and it won't give you a headshot, but they can shoot thru their cover.
Edit: the absolute most pathetic type of player is the one with invective. No skill.
Another Edit: Obviously the players we have no respect for are the ones who blatantly cheat. IE (lag switching/hacking 'some will claim consoles can't be hacked' they are naive)
Another good one pointed out several times are the people who use (absurd glitch spots on the map, like the pipeline on rusted lands) but that's just a super duper head glitch spot. Kids these days.
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People who can't accept the fact that they were killed. People who always look for excuses when they die. People who have egos higher than their I.Q. People in general. List goes on.