I’ve noticed that. Living in Virginia I see the folks going north and south on the 95, and almost always without exception the PA drivers are tailgating, passing, going 20 above the speed limit.
In NorCal on the 5 you might also see a fully tinted purple low riding car every few weeks (I'm talking about a specific vehicle I see because I drive it all the time) with Washington plates that drives like a bat out of hell. Not that native CA drivers are much better, but they are.
NJ - Drive like they're in NYC, no turn signals, will try to merge/squeeze into 3 inches of space.
NY - Must not have lane rules, they just sit in the left lane regardless of speed.
PA - Highly aggressive and dangerous. Will tailgate you, will brake check you, will drive 30 over and punish you if you happen to block their path.
FL - Wildcard. Everyone is from one of the above, so who knows which you'll be dealing with.