I have noticed this in my last LFR. When I told a fellow warlock "hey , you're doing less dps then the tank, if you want I can help you with your rotation".
The reply i've got was "mind your own fucking business".
I mean this is a game and it shouldn't be compared to real life where if 3 people try to move a couch and one doesn't put any effort in it, as long as the couch gets moved nobody should pick on the third guy who is just pretending to move it.
But honestly I don't understand why every single rule in the game is protecting the people who don't try to improve. LFR has rewards that makes raiders interested enough to clear it and thus boost players who do have the gear but don't have the skill to do it.
This encourages people to be lazy and i don't understand why.
When the new patch came out and raiders stoped doing lfr as they were interested in soo , i was amused to see my friend wiping again and again at throne of thunder because there werent enough raiders to carry everebody.
Oh well i digress. My point is, that i can hardly imagine how these people play LoL or dota2. If they can't stand even the most minor criticism, how can they stand the down right insults coming from a dota 2 team when you underperform