Though I do laugh at the overreacty nasty comment. I find that just asking nicely tends to always work a lot better than an onslaught of childish name-calling and possibly cursing.
The way I figure it, if you wouldn't say something that you wouldn't say unless you were anonymous, you probably shouldn't say it to begin with.
Unless it's just to screw with someone jokingly. Like commenting on a neighbor's post anonymously and being like "8o) I know where you live~ <3" or something. Just to mess with their head. That is acceptable. The only times I ever go anon are if I don't feel like creating an account for something. XD;