When someone reposts a blog post on Facebook, and I read it and realize that rather than being a snarky social commentary, its actually quite condescending and mean spirited. And people I otherwise respect are leaving "yes!" comments. And I can't respond because what's the point? If someone is willing to dedicate an entire post to (paraphrasing) "10 reasons why decision Y is terrible and you are an idiot if you didn't choose X like me" nothing I say will make a dent.
Also obnoxious is the friend who posts things like, "ugh my run was sooooo slow today, Z min per mile" where Z is faster than my pace on a good day. Thanks for that.
In both these cases, I don't honestly care that they have different opinions or goals than me. What bugs me is the annoying, negative, and judgy way they were presented. Both things could easily have been written in such a way that anyone might relate, like "10 reasons why I decided X" or the slow run comment without the time.