Courtesy comment:
Sometime back I had some of the spelling Nazis giving me Hades over a misspelled word.
So to fight back and give them something to do besides boring others I started to intentionally misspell words in my posts.
Another area is the people who will post an article and then try to restrict the thread to only those comments favorable to their point of view.
LOL!! Thank you for not mentioning that someone else had already mentioned the Posting Police — I shoulda read the whole thing!
Regarding the rest, there's sometimes a fine line between viewpoint discrimination and thread "hijacking." But I am often amazed at the vitriol spewed by people who try to read others' minds or intentions and go for the jugular over reading comprehension errors, lazy misunderstandings, awkward wordings, et cetera. Thankfully, the hotheads themselves often can't take the heat around here and are usually called out.