Tanks are just very exposed in LFR due to there being 2 - they're very identifiable, they need to be relied on and they are responsible for a majority of shit going down.
This creates the illusion that tanks are responsible for give all and take all when DPS can roll their face and do 50k. (Which is beyond me how you actually do)
But Ghostcrawler is right - Stop being stuck up and rude, and people will feel more inclined to be friendly/do stuff for you.
Basic social skills right here folks - screaming and crying won't get you for, even if your 5 year old mind tells you it's the 100% right thing to do.