I'm afraid I can't say what I would've done because the boards don't take kindly to talk of violence , my name isn't psycho for nothing.
I hate bullying and become very confrontational whenever I see it, it helps that I'm 6'2" and a little mean looking .
The line "Hoi ,why not try that with me?" usualy gets thier attention , I practice Muay Thai so I am pretty confident of handling most situations.
You probably did the right thing under the circumstances.
A pic would help the police if things had gone tits up .