Although I agree, you can't force someone to be nice, or respectful, I wouldn't hesitate to have a really serious discussion, immediately, with the HC of the offending team and alert him, in no uncertain terms, that disrespectful conduct will NOT be tolerated and the display by his captains is an indication of foreboding conduct that you and the crew have been alerted to.
The HC would be reminded we are all there to play a football game, NOT to oversee a brawl or war.
From that point on, ANY USC behavior would be considered FLAGRANT, and offenders including coaches, risk immediate disqualification for breeches of behavior.
Either YOU are in control, or you're not.