Faux ignorance/confusion; usually as an attempt to rile people up over a controversial topic whilst looking oh-so-innocent. “But I don’t understaaaaand, what does non-binary even meeeeeean; I just want to learn…” Do you buggery!
Posters saying “We’ve only got the OP’s word for it” or “I suspect this is only one side of the story”. This is true of literally every thread on this and every forum ever!
The annoying trend lately for putting “this is relevant” in brackets after a particular point. I should bloody well hope so - why would you be sharing irrelevant details?!
”You don’t seem to like her very much”. Usually said in a very po-faced way when someone is describing a disagreement with a friend. Surely everyone occasionally gets pissed off with a friend without it being outright dislike/end of friendship territory. I’m certainly not arrogant enough to think I've never done anything to annoy a friend, so why can’t the opposite be true?
”I wouldn’t dreeeeeeaaam of doing XYZ”. It’s so embarrassingly uptight and old-fashioned; I just can’t imagine anyone saying it in real life. And what does it even mean? Is anyone going to actually say “Well yes, I do dream of expecting an inheritance, but I’m not going to say so”?
The oddly twee language some posters insist on using. I never realised adult women used words like “Goodness!”, “Gosh!” and “Oh my!” until I came here. And ridiculously overly flowery language, often in threads about food, and usually used in the misguided belief that it makes them sound more intelligent or interesting. “I also drink lattes, but I cannot listen to this heathen talk of adding brown sugar (sugar! *faints). I will not even allow chocolate sprinkles. The faintest whisper of cinnamon is the only acceptable garnish”. You can shove THAT up your crack.