There's certainly a plenty of those, although I do hide a particular hatered for something that pops up in chats, comment sections and even forums like this one. I believe that discussion, exchanging thoughts, debates, hell, in some cases even just name-calling are good things. They broaden the mind, spark up new ideas, simulate your mental abilities, expose you to other opinions therefore making you more aware and able to reinforce your own views having heard the opposite ones instead of locking yourself out of any other thought than the 'right' one.
With that in mind, the amount of irritation I get out of seeing a phrase like 'Stop arguing, guys, you should just blindly say yes to what you're reading or never comment on anything that even slightly goes out of your minds bounds as to what is right and wrong' is colossal. So often do I see this aggresively-apathic, close-minded behaviour show up. Aside from asking to stop using a medium for its intended purpose and threats of being aggresively told how the person really doesn't care about the discussion going on, this kind of thing also really serves to close minds, which is a thing I really despise.
Granted, it can be appropriate in some cases where the argument is really out of place, but outside that, even if the 'discussion' turns out to be just two jerks are going at it in a Call of Duty match, I say let them have it. Let them shout their minds, say what they want to say, however stupid it may be.