Agree with the 'NC for this' comment. People do that because people accuse anyone new of being a troll (interesting first post OP!') OR they go rooting through peoples older posts...
People have someone throw something in their face sometimes, from a thread they posted AGES before, that is nothing to do with the current thread they're on.
Some superb examples on here btw. I particularly loathe ANYone using the word 'naice,' and I judge them instantly as being an arrogant ass who thinks they're middle class.
Also hate 'no?' at the end of a sentence..... 'but surely everyone owned a rubiks cube in the 1980s, no?'
And yeah, also picky bits 'darked on,' spider willies, and snapped and farted (that was never funny!)
I also HATE it when people say 'are you thick?' or 'you sound unhinged.' 'You sound unhinged' is an incredibly cruel thing to say, as it's basically implying you're not right in the head/deranged/mentally ill...
Oh, and 'educate yourself' does my head in too. SO fucking patronising. Always come from people who think only THEIR view is correct too.
And yes to LTB, when a poster moans about their DH doing something annoying or shitty. As IF anyone can just pack up their whole LIFE into a couple of suitcases and just fuck off. 
Also, the idea that any woman can just start her life over, re-train for a fabulous new career, get a new bunch of cool new friends, and find a sexy rich amazing man 15 years younger than her age, and buy a smart new apartment in the city, at the age of SIXTY. 'oooh but you're still a spring chicken hun, you're a babe, I know dozens of women who left their DH and started over at 58/60/62/65 etc, and now they have a better life than most 20, and 30-somethings.
Also hate the constant claims that everyone in their social circle didn't have their first child til they were 43. Like it's sooooo normal and regular and just everyone does it. And the fact that womens fertility starts to wane at 32/33, and lessens significantly after the age of 35/36 is royally ignored. As is the fact that there is very likely to be problems and issues with the pregnancy and the birth (and possibly the child.) if you leave it til your 40s to have a baby.