It's annoying when some brony refers to people as "everypony" or "anypony" or "ponies." Um, they're people. I get that it's cool and all to act like you're in Equestria, but come back to reality for once.
Having a tragic backstory (ex. often bullied, been raped, dead relatives, etc.) does not excuse being an asshole. Especially not to people who have no idea that you went through whatever you went through. They shouldn't have to tread carefully around you because of the possibility that you might be sensitive to it.
Some don't seem to get that even if we abolish the most common things people complain about these days, the world will find something else to complain and "lose faith in humanity" about.
Speaking of, nobody really cares if you lose faith in humanity. Every time I see it (and I see it quite a lot), I think, "So you're perfect and the rest of humanity is trash?"
I don't think people know what the words overrated and underrated mean anymore. Essentially, it's basically saying that they get more/less popularity than you think they deserve. Fortunately (or unfortunately), the popularity of these characters is objective—so "overrated" and "underrated" are both opinions. Example: "They're extremely popular" is saying that they're very well-known, while "they're extremely overrated" is saying that they're way more well-known than you think they should be.