Totally.
I was at a non league game earlier this season.Stood watching it with my cousin and some of his mates, this season this club has suddenly got a "firm"(mostly those banned from local league clubs, apparently) Well it kicked off at this game. I've never heard anything like it, guys in the mid/late 40s and 50s talking about how great it is and its that the "youngsters are coming through". Its a weird subculture that I don't understand.
My cousin isn't entirely innocent, when i was walking out him with he said about it, to which I replied, its not my thing at all. The reply came of its important though that people know they can't come here and take the ********, else they'll get a slap...
I've definitely noticed this season at this level, wat more abused aimed at players, numerous times smoke bombs end up on the pitch, and reports of trouble at games(i'm talking about this non league not Wednesday, just so no one is confused).