I don't think that this type of event warrants a bikeforums.net discussion. For me, I would get the name of the server, the manager, and the store number, and then go home and compose a letter to the President and Chief Operating Officer of the fast food chain or its parent company and be done with them.
EDIT: The letter should focus on their demeanor, their language, and their inability to treat a customer respectfully. Do not question the policy, it is not relevant to them. The behaviors of employees...that's relevant.
Writing about it here is like farting in the wind.