It's unfortunate but this problem has been around for as long as I can remember. Hell, back in my days of playing WoW with a paladin, I was set for tanking and went to a group finder for some raiding. Now there used to be a program that would give an item level of a person and people would use that to assess whether or not they would be kicking you from the group. So I find two other people for dps, pass their bs inspection, and then we find another person specced for healing. His items were a bit off, but he would still be able to handle it just fine. However, the two guys weren't happy at all with his item level, so they were going to kick him. I said to them if they were going to kick a much needed healer then they would have to find a new tank as well. We at least got to finish that raid.