Someone wanted to roll for me in dragon soul earlier because he wanted to help me since he has all gear on both specs and I was threatened by 3 other raid members to have it screenshotted and reported me for being a "ninja"
How is this ninja?
I'd perfer a gamemaster response over public opinion
Probably for the fact that if the player already had the equipment they wanted, they shouldn't even be rolling in the first place. They don't need it, after all. The whole point of rolling is everyone having the same random chance of winning the item, and having someone who doesn't needs it roll anyways to give it to you is basically fixing the chances in your favor.
The final say is on the GM Team hands, and you contact them with in-game tickets.