Things to think about before you call someone "Bad"

[Penthea]

In that instance, why shouldn't the remaining players in the party just kick that player if they can't adapt? I really doubt people would actually accept an ice mage, 90% aggro tank, or a cure 1 only whm.

I didn't debate whether the player should be kicked or not, and this isn't the argument you were having. You were stating people should go and practise in their own time and I explained that in a situation in which you're told to do something mid-instance you don't have the luxury of practising before being expected to show noticeably better results.