As soon as you voted to vote-kick the guy, his friend was rejecting your attempt before you could tab to the other boxes.

Tanks and healers start out the world pretty entitled, problems using LFD as a boxer aren't unusual. Because of sub timing I ended up with a 4 man paladin group last summer and had lots of healers that would just refuse to heal and see what happened (answer: nothing. I was wearing heirlooms and had built a lot of self healing into my tanks rotation at the expense of damage for just this reason). I find being friendly and passing on almost all the loot makes people treat me better but there are no guarantees.