"Imitation is the sincerest [form] of flattery"
He didn't hurt anyone, he didn't claim any health benefits, he didn't cheat or swindle anyone out of their money. Leave him alone.
I've had people actually defraud me and I would never in a million years assume the police would press charges, but if someone puts on the wrong costume and doesn't steal anyone's money it's the most important story in Canada.
"Anarchism is not a romantic fable but the hardheaded realization, based on five thousand years of experience, that we cannot entrust the management of our lives to kings, priests, politicians, generals, and county commissioners."