If you want to use an alias to praise, have fun, whatever, fine, I don't care, but if you want to use an alias to be critical, either cowboy up or get off the bull!
Or a person could choose to simply go back and delete any negative or controversial posts that he or she has made after the fact. Personally, I find that as distasteful as name calling. Once someone resorts to name calling they have in effect lost the debate.