Like I said Banjo, I don't know what the rules and regs are within the terminals (I rarely go in them).
I don't think it's a matter of letting the DJ person 'get away with it', but if you feel that the person may have overstepped the mark, then why not ask to see the airport's duty terminal manager in the presence of the person who asked you to stop. You'll get final clarification, and they'll also know whether they're within or outside their boundaries.
Cheers
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