Maybe there are other topics where the same phemonen exists. I'm not sure if off the top of my head I can think of one where it gets so intense so quickly - long, detailed, emotionally charged anecdotes immediately when school comes up! [I love a good yarn, and am not judging or belittling people for expressing themselves here, I must stress].
I have speculated in my comfy armchair as to why our education structures seem to make venting such a need for people. Anecdotally, there does seem to be a suggestion of some sort of lingering and powerful malaise around the whole thing, in any case.
I wonder if it's like an abusive relationship - the emotional work required to move on and have better relationships (i.e., different educational structures) gets so large at some stage that all you can focus on is "coping". And you're sort of stuck, and the cycle more or less continues.
EDIT: may I just add - I read that whole article, and am very fond of Ramanujan. He made university much harder for me when I learned about his existence, as my maths classes seemed so far removed from whatever it was he was doing.