Actually, I'm pretty sure it's the results that causes the hate. Nobody hates a loser. 99% of fans don't know squat about another team's fanbase. I hated Nebraska of the 70s - 90s solely because of their success. But their fans were among the most civil and welcoming out there, and there was truly nothing to hate about coach Osborne. And I hated Miami during their heyday of the 80s because they were arrogant winners. It's the same with folks who hated Duke basketball -- it's damn near impossible to hate on Coach K (unless you already hate the program), but their success was maddening for non-fans.
There may be some Penn State wrestling fans who act cocky and superior, and that certainly doesn't help with outsiders' perception of us, but it's still the nonstop, overwhelming success that causes other fans to hate on PSU.