Let me preface this by saying that I am in total agreement with the folks who say simply block the perv and don't let him or her determine your choices.
Having said that, it can be super creepy to encounter this level of deviance personally rather than just knowing intellectually that it exists.
A couple of years ago, I wrote a couple of posts about Lolita. About a year or so later, I got notification that I had a new comment on one of the posts and it needed approval. The comment was from someone who claimed that I wrote a horrible review of the book because I didn't even know the difference between pedophilia - being sexually attracted to children - and hebephilia - being sexually attracted to adolescents aged 11-14. He then went on to say that of course I would be as short-sighted as everyone else because people just don't understand the beauty of love between a grown adult and a pre-pubescent child.
Needless to say, I did NOT approve the message. I reported it to WordPress, I closed comments on the Lolita posts, and I deleted the notification email. I didn't take down the blog, or even the posts. It didn't stop me from using WordPress.
It DID, however, creep me out to no end for days.