While recently running unsynced older content, a player has been joining that is gimping his dps intentionally. The raids themselves are easier now, but strong dps will of course help skip several mechanics and push us past any problems we might run into. This player however is not only a weak dps, but also wears gear at level 60 that wasn't even BiS at the end of 2.0 when people were farming the content. In some cases this is fine, but when its a dps check to skip mechanics it clearly is a problem. I have asked nicely, then firmly, then locked them out of my parties by having the item level too high. This however led to them still joining by switching 1 piece out just to meet ilvl and switching back.

As we keep ending up in parties together for raiding such content, with other players are frustrated as well, I am at a loss of how to proceed. Should I blacklist so they cannot join my parties? Should I continue to ask them to change their gear?