It just bounced around in my brain until I had to vomit out a response to stop myself from going nuts.

Just an idea: How about you write a response... but in a text file that you just save on your disk and never publish?

Here is a more complicated solution, if you are a programmer. Once when I was irritated by idiots on some website, I created a GreaseMonkey script for a browser that has highlighted the comments of the idiots with yellow color. Their usernames were hardcoded in the script. This trivial change had a huge psychological impact. When I saw their next comment and it was highlighted, I was like "oh, that's just some known idiot, no need to take this seriously, just laught about it", and it didn't hurt me at all. And when I found a new hopeless idiot, I added the new username into my code, and refreshed the page; so I had my revenge. It was incredibly calming, and no one else knew about it.