Off the top of my head: Minnesota, Michigan State, Northwestern, Wisky. I know there have been others but I can't dredge them up at the moment so I won't list them unless I can remember who specifically said what.What schools? I get PSU because Pedos, and probably Wisconsin because they have awful fans so they receive similar treatment as we get up there.
Facilities people I know who have hosted big 10 and national wrestling tournaments have often singled out iowa fans as the most belligerent and nasty. And that comes from big 10 and other venues alike.