I agree, Allysson, that drives me crazy.
In a similar vein, when two or more people are having a discussion and a third party butts in and says "Don't fight over something like this!" or "Stop female-dogging!"
We are not fighting. We are not female-dogging, and we are not upset, nor is the conversation getting heated. We're having an interesting discussion, and exchanging thoughts! Thinking is fun! Try it sometime!
This happens for example in online gaming, when discussing strategies to attack a creature. Two or three people in the crew will be calmly weighing options of what weapons, routes etc is best, and there will be one other who says "Please don't fight over what weapons are best! It's just a game!" AAARGH.
And a few days ago I was reading an old topic on a rather well-known humor site. It was about storyline flaws in Harry Potter. Some commenters brought up, in a calm and polite manner, a few explanations of why things worked in certain ways in the books (for example, the author of the article seemed not to know why wizards don't use electricity, and some commenters calmly explained that it's because magic makes electricity go haywire). Many other details were discussed, too. I thought it was really interesting to read through the comments section, however, some others had posted: "Wow so much rage here! Lighten up, it's just an article about a fictional world, nothing to get upset over!" And I thought: "What? Who's raging? Who's upset? Nobody but you!"
It's really annoying. Are people that starved for drama, that they need to imagine it where there is none?