Trolls are interesting creatures. They all differ in their level of insanity, but they all have certain characteristics that make them the same.
They never leave a link so that they can be debated.
They never get the point of your post.
They latch on to one word or phrase in your post, and attack you on points that are, at best, secondary to your point.
It's obvious that they've never heard any other point of view than what they are spouting.
They are, almost invariably, childishly vulgar.
If you're getting the best of them, they change the subject.
They eventually run away, never to be seen again.
What? LOL.