Wow. The fact that anyone actually replied and tried to justify this or even suggest it's even okay is genuinely surprising.

The fact of the matter is that you're all babying him because he's a DPS. Had a tank, or rather both tanks, been wearing i110 weapons it would be physically impossible to clear. There is no tank in the world who could keep hate off a DPS who has a proper weapon for lv60 content while they used an i110 weapon. Now I know that people say, "but since they cleared that's okay," that's not okay. Just because a DPS having a low level weapon doesn't mess up the group like a tank does, doesn't mean they shouldn't be just as responsible as a tank would have to be.

Also people acting like the OP is being elitist or having a strict requirement or something. It's i110. You can literally buy an i150 weapon from Azys Lla. It's very clear this was either deliberate or a very unfortunate mistake, but either way, there should be some kind of warning alerting people if a piece of their gear is dramatically lower than the item level requirement.