"Four of the top ten" research institutions is probably part of the reason for your experiences. I went to an elite private undergrad as a scholarship student and was sexually abused by the son of high powered lawyers, probably awful people themselves, who targeted scholarship students, international students, etc. because we were vulnerable with no recourse. I then went to a highly ranked but not super sexy public school for my PhD and my experience has been significantly better.

Bad actors are attracted to glamor and prestige because they're part of the cloaks and levers they use to escape consequences. Bad actors are far less attracted to, just as an example, living in Wisconsin, Michigan, or Indiana and telling people at conferences that they work at UW rather than Cambridge. UCs are also vastly more welcoming and supportive of working and middle class students than HYPSM even at the graduate level. That doesn't mean that you won't find any assholes at these places, and go too low in the rankings and you'll see ugly competition over scarce resources, but there's a sweet spot where more honorable people who aren't chasing prestige cluster and you'll find more support and recourse. Public schools ranked 5-15 are best for students without significant, significant social savvy and other forms of protection, IMO.