A date at the movies & fat guy checking out my girl. intimidation?

today i was standing inline with with my girlfriend to go see the movie vampires suck!! when this (oversized) dude and 4 of his mates is looking at my girls but.. He was like 40 something my girls like 17 im 20..My first thought was to punch him out but im like 6'1'' he's like 6'8'' and huge lol So i yelled out hey lambchop keep your eyes elswhere!! then him and his 4 buddys walk upto us and say i dear you to say that again unless you want to eat your teeth..they were all very big guys in a bikers gang i think? but i feel as a soldier i could have done more then let them talk to me like that!! now its really eating me up lol