Wow, two rant posts on the same topic in one morning!!
For me, I don't mind any registered, active blogger's replies on my blog. I don't really appreciate swearing, but I'll put up with almost any amount of personal shot (especially if it is well thought out, shows some originality, or just plain makes me laugh!).
I think everyone who reads my blog knows how I feel about "anonymous" "Snipers" and the like. Of course, that doesn't include friends and members of other blogsites who I have invited into "my house". For any of the snipers in the woodline and snakes in the grass, I take it on a reply by reply basis to decide whether they stay, or all evidence of their presence gets zapped into the dark matter of cyberspace!! ;~D