The only way that I have found to stop loud and obnoxious people is to retaliate with loud and/or obnoxious songs.

If anyone complains, you can say "Hey you were the ones that started being rude"

Here's a few suggestions. (some of which will be on my next CD)

Four Old Whores        
Cathewsalem
Horrible Song
Mayor of Bayswater's Daughter
Seven Dear Old Ladies
Maggie May
British Workman's Grave
Come Inside
Thrashing Machine
Country Vicar
Don't tear it
Roll Your Leg Over
If I was the marrying kind
Nobby Hall
My God How the Money Rolls In
O'Reilly's Daughter
Ancient and Old Irish Condom
Follow the Band

Let me know if you need lyrics.