I maintain what I said. Actual usage of "underrated" tends to stick to things that are simply not well known. Usage that is meant to say "Only 7/10? This is totally underrated!" is much more limited. This, of course, is based on my personal experiences of where I've seen them used.
So to reiterate, usage of "underrated" does not typically infuriate me because when I see it used, it's to claim too few people know about it, or tried it out. Therefore, I am not saying that underrated doesn't mean what it does, I am saying that because I hardly ever see people using it the way I don't like, I don't mind the word. On the other hand, it's incredibly rare to see someone use "overrated" in a way that's not simply saying "I don't see why people like this".
I never said my hate was quite rational. Most of it is just me disliking contrarians and party-poopers.
It's the difference between saying "I don't like X", which is clearly structured like an opinion, and "X is overrated", which is structured like a fact, and a ridiculous thing to say, at that. I also have extreme problems with "X is crap" and such. It's an issue with the way people say things, and how often they say it, more than the word itself.
This is why I'll never complain at anyone directly for using it. I won't constrict anyone's way of expressing themselves without a better reason than me just not liking it, but the fact remains that the way people phrase things as if they were facts bothers me (only if they're negative, at that) to no end, and "overrated" is one of the worst offenders, prompting my rant.
Unlike "X is bad", "X is overrated" is a more direct judgement on people.
X is bad -> there are flaws -> which implies people who like it are wrong VS X is overrated -> other people are wrong -> because there are flaws
It's the difference between "This piece of art is terrible, (why do you like it?)" and "You are wrong for liking this piece of art."; One doesn't cast an immediate judgement on other people's opinions*, and the other does just that.
Again, not exactly a rational thing, but even if "I think X is overrated" is used, the whole "judging other people" remains, even as an opinion. It's a troublesome word I just don't like.
*Something I heavily dislike. Who am I to impose my thoughts on others? I should state my opinion and have others comprehend it, and I should try to comprehend theirs. Discourse does not come from blindly denying what one does not agree with, or taking some sort of imaginary high-ground. And the first step to discourse is certainly not "All those people are wrong for liking this".
Another issue is that when somebody says something is overrated, other kindred souls flock, forming a vocal majority and making the whole thing quite ridiculous, because a majority cannot ever claim something is overrated, by its very definition.
I know I have some extreme opinions about the way people communicate. I know I'm an idealist, and also a hypocrite, but these remain my honest thoughts, fuelled by emotion. If arguments are to be had, let them be civil an constructive, without hate. Mindless praise doesn't need such limiters, as it hurts no one, unlike mindless bashing.