Bernie is an interesting chap. He started his collegiate education at Brooklyn College, a public university, but soon transferred to the University of Chicago (in my humble opinion, as non-alum but with many colleagues from that institution, the best overall university for serious undergraduate study in any traditional discipline - Math (Harvard may be slightly more rigorous here, depending on whom you ask), Physics, Computer Science, Biological Sciences, Chemistry, History, English, Economics, Psychology. Their graduate schools are equally excellent.
However, Bernie admits he took none of his elite education seriously, preferring activism outside of the classroom to learning deeply about the complex issues he's protesting about. Bernie is lovable and occasionally stumbles onto some truths (like the need for powerful companies like Amazon to start paying more than 0% taxes by closing loopholes), but in his own life choices he seems to enjoy accumulating his own wealth (nothing wrong with that) and attending elite private colleges like Chicago while telling young people they should go to public colleges paid for partly through higher taxes. It's a type of hypocrisy that's very human and forgivable, I suppose, like Al Gore ranting about global warming (a serious issue) while generating a disproportionately high CO2 burden in his own daily life.