I'd have to double-check in game, but I'd imagine only the leader could kick someone from a party. My solution, if he continued the behavior, would be to tell the group why, leave, and then re-queue. At best, I'd try and communicate with the other people in your group... maybe you all can quickly re-form after you've left…
Yeah, this is what I do. I watch the first few rolls and then maybe spot check some as we go along... My default is usually roll Greed on items my class cannot use or that are definitely not an upgrade, and Need for items my class can use (if unidentified) or if it actually is an upgrade. I havent had a problem yet in this…