Take this from a native-born Pennsylvanian.
I'd say it's true it's a relatively friendly spot, but there are a couple dozen campuses all over the state. I'll assume it's the central campus in State College, a big town by PA standards. The gay scenes, after living there to work over one summer, is rather sad. Only one bar (but again, by PA standards, it's impressive for a town at its size). Maybe because I've been living in a major city for so long that seeing any less isn't much to me. Finally, it was a pain to encounter gays as well (only saw an handful myself). However, a GA member used to teach there a few times during summers and spoke positively of that town and school as well.
I'll have to warn you though that it's a moderate town smack in the middle of one of the most conservative parts of the state. Beyond Centre County is pretty much Republican and "redneck" land. Those from Pittsburgh and Philadelphia like to joke that PA is Pittsburgh to the west and Philadelphia to the east and Alabama in the middle.
If that worries any future college student a little bit, then consider University of Pennsylvania instead. It's right in Philadelphia and it's a very liberal city. However, it's an Ivy League school, so its admission standards may be high.
My judgement may be flawed anyways, considering that I come from the mountains and forests and I never, ever had any problem whatsoever being gay in my own home region.