Most bands will "intervene" if a bad chant starts up if there is no play on, but most college pep bands get boned from the get go...no money for them and new music, so you are stuck with old 70's tunes that sucked then. Adding the words to "good" songs/chants is a good idea, but it doesn't always work either. The best way to get a group of students do do the "right" thing is do it ala (*SHUDDER*) the BADgers. That student section rocks, is loud and cohesive, but actually generally "behaved". Teach 'em young and teach 'em often as freshmen.
WPoS