Ugh.. this thread hasn't died yet? Best way to handle this is just to ignore them. They post in a thread.. don't reply to them. They will either get tired of it, and cowboy up. Or they can continue to grumble anonymously till the cows come home. Either way everyone wins. There's really no point in setting the required level to post at 90 because the really die hard ones will go burn up a mule to 90 (like they burned the rest of their jobs on their main) to keep their anonymity intact.

Only way to combat this issue is to refrain from acknowledging shady posters.