Ontario Highway Traffic Act

Traffic's going 5km/hr bumper to bumper. People celebrating and making noise on the street. I am also going 5km/hr and I overrev the engine a couple of times (clutch in), no burnouts or anything. And the cop gives me the careless driving charge? I did not put anyone else or myself in danger.. and at 5km/hr??? Is this a joke? I asked the officier ...