The dictionary quoting is just plain silly I think, unless you want to clear up everything that could be taken a different way before the debate really starts. But you'll find some posts in a debate where the first 'argument' is made completely out of definitions. How do you argue with that?! I saw a post recently, although I won't mention who wrote it where it was just as described above...
The last point, about the abbreviations is annoying too in my opinion, and work like the all-caps in the sense that they make everything more difficult to read. They also work against the poster because they come off as being a moron. If I see a topic title that I find interesting, and I see a bunch of abbreviations, stupid ones, I just skip it even thought it could be a good post. At least ATS is a mature discussion board. I just can't stand the ones where it's common to see something like "stfu u l33t n00b! u r teh uber suxor...gay fag". Surprisingly 'gay fag' is quite common, although I think this acts as a double negative



