Seconding your suggestion because it's worked well for me every time I found the strength to use it. Also, when you feel really aggravated at your opponent's tone, fogging is a useful and civil-sounding technique.
Worked well in what sense? David talked about netting upvotes, but surely that's not a main consideration for you at this point. I'm hoping that being nice and responding just to substance might make the other person less belligerent and a better contributor to the community. I tried this on Dmytry and it didn't work, but I wonder if it has worked in the past on others. Do you or anyone else have any anecdotes in this regard?
I'm worried that LW doesn't have enough good contrarians and skeptics, people who disagree with us or like to find fault in every idea they see, but do so in a way that is often right and can change our minds when they are. I fear that when contrarians/skeptics join us but aren't "good enough", we tend to drive them away instead of improving them.
For example, I know a couple of people who occasionally had interesting ideas that were contrary to the local LW consensus, but were (or appeared to be) too confident in their ideas, both good and bad. Both people ended up being repeatedly downvoted and left our community a few months after they arrived. This must have happened more often than I have noticed (partly evidenced by the large number of comments/posts now marked as written by [deleted], sometimes with whole threads written entirely by deleted accounts). I feel that this is a waste that we should try to prevent (or at least think about how we might). So here are some ideas: