Believe it or not, I've been raged at for trying to be a team player (and for doing well). A recent example (team builder):
I'm Akali mid. We have a Draven top, a Sivir ADC,and Morgana support. I've run with the Draven before and seen him complain about me taking his kills before (because somehow, the fact I won a 1v2 mid should translate to kills for bot lane, but I digress), but this was a whole new level. Our Shaco jungle forgets smite, so I let him have mid now and then to farm up and get levels while I roam and pick off stragglers and help feed Sivir since I am ahead from some early kills on my lane opponent.
By mid game Sivir and I are doing quite well (Morgana was getting her fed and I fed her a few kills during my roams). Draven, on the other hand, is doing abysmal. I ganked for him once, he ran away, I got the kill, he complained, I didn't gank again.
He proceeds to flame both the jungle and myself (he didn't even realize the guy had no smite, then called him a troll, then started attacking me when I defended the jungler for making an honest mistake; more on the jungler later). He started saying how I took all his kills (since, you know, I had one top lane kill at this point and I was in the high teens for kills overall) and that it is a team game and the kills should be shared. I explained how Sivir was just as fed as I was and the CS leader. Sivir and Morgana both said they were doing well and I was a huge help. I tried to explain that I can't help that I got fed off the enemy Morgana (who was getting insulted in all-chat, and again, I defended her and got a friend out of it at the end, which is pretty cool, she was really nice) and that I can't make those kills appear top. He just continued to berate my "lack of team play" all the while avoiding any real objective control. The best is every time I killed Yi (it was a DPS race, he was super fed; our fights lasted like 2 seconds tops) he said how I stole his kill (even if he didn't get an assist). I was like "With Yi, I don't have the luxury of trying to feed you, if I don't kill him, he will kill me." That didn't go well for chat for a bit.
He then proceeded to play even more poorly, refused to show up to team fights until the end (and complained how we took his kills when he got there), and continued to fail to see the importance of defending towers (how someone makes it to gold in S4 without understanding tower importance is beyond me). By this point we are a bit ahead in kills but he is costing us objectives. Morgana tries to coddle him which only fuels his Akali bashing (did I mention this is a guy I play with often?). At this point I'm like, look, you told me to bring Akali and when I get ahead on her, I really get ahead. He then told me he thought I'd be smart enough to share the kills with the ADC (note that I did feed Sivir in my roams, and I think I had only like 2-3 kills more than her by this point). I didn't bother responding (nor did anyone else, I think Sivir muted him at some point because she responded to everyone but him).
We are starting to lose hard in spite of our kill advantage and Shaco (our smite-less jungle that I sacrificed my own CS to keep in the game) starting calling out where he would be and giving the enemy free kills because his mom said he had to go to bed.
Thankfully, Mr. Draven unfriended me before I had a chance to the same to him. The thing is, no one this entire match (on our team anyway) insulted or blamed Draven. We only countered his statements with facts that were positive or obvious, we never pointed out anything that made Draven or anyone else look bad. I don't know how, but this made things worse.
**TL;DR: **Draven top complained because ADC and Mid lane got fed, threw game by refusing to help take or defend towers, Smite-less Shaco jungler up past his bed time and his mother was angry so helped put the nails in the coffin. Made a new friend by sticking up for her after I did well against her in lane (and who came back to be really effective for their team after some words of encouragement from, ironically, her lane opponent).
Conclusion:
I think negative people will find reasons to be negative. If you are doing bad, they will call you out. If you are doing well and they aren't, they will blame you. You can't win.
Match:
http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1877388944/220515279?tab=overview