i'll start. i saw a ask reddit post saying something along the lines of "men of reddit whats something women can't understand" and the comments were just. oh my god. the main one that made me want to puke was "when dudes walk by each other and nod" and the whole fucking thread was just fedoras with arms soypogging like it was some secret language or something. "when you nod upwards, it means respect!!!!!1!!11 when you nod downwards its aggression!!!1!11!!!!!" as if women dont do the same shit.
do you guys have something similar to share?
That one and some others were deleted by order of then-CEO Ellen Pao, it was like throwing a lit match into a powderkeg. The things r*ddit holds most dearly - misogyny, racism, and xenophobia - erupted from its sizeable population of reactionary neckbeards into a shitstorm of fist-pounding tantrums like nothing the site had seen to that point. The insults and threats of violent fantasies were endless and many were Sinophobic in nature. A few years after it happened I remember a discussion (maybe on /r/ShitRedditSays or similar) around how the bigots who inhabited /r/FatPeopleHate et. al., were heavily overlapped with same crowd who would later be found in The_Donald and related right-wing hate subs.
NATOpedia has an article for her and there's some detail on this incident if you want more slop on it (I didn't read every word of the article, just skimmed, so can't say whether it's tainted/biased by one of the neckbeard power editors).
Reddit can even take something like hating CEOs and make it not cool.