Just FYI, CMs do not confront line cutters. We waited in a long line for food, only to have a man come in from the side entrance, push his way right in front of us as we moved towards the register and proceed to order. The CM helped him, then apologized to us for the wait when he was gone.
I'm not saying don't say things (politely) like, "Excuse me, the end of the line is back there," but if you're expecting Disney to swoop in and control the behavior, you'll just end up disappointed and frustrate yourself against the brick wall of entitlement that line cutters bring with them.
Also, and this is just my opinion, but I don't understand why the OP needed to take a parting shot at the man in order to extend the confrontation. He was informed that he cut in line, he clearly wasn't moving. Had I witnessed that scene as described I probably would have come away with the impression that the person who needed to have the last word with, "yes, please do, I want to hear what you tell them" was almost as rude as the line cutter for not deescalating the situation.
No one wins in a scenario when guests get into a verbal pissing match over the Dole Whip line.