I worked hard and got into one of these prestigious universities for my Masters, but grew up lower-middle class, on the countryside, in a not very healthy environment.

Having seen it first-hand, I can only agree. There's so much privilege at these institutions, it's almost sickening sometimes. I don't want to throw everyone in one pot, there's certainly genuine, decent people there. But there is so much self-importance and arrogance floating around, and just this casual and unquestioned attitude of superiority.

What I do want to say is that pretty much everyone I met there had a base-level above average smartness and/or work ethic. But I also mostly hung out with STEM people. Didn't get to know many managerial or related types.

Sorta like tech companies these days.

Where are they claiming AP math by 5th grade? I seem them saying algebra by 5th grade, which is a far cry from, say, AP Precalculus let alone AP Calculus AB or AP Statistics.