Apparently the Driver refused to pay and the 'Flanelinha' got pissed and start throwing stones but this Driver wasn't standing for it !

In almost all Brazilian cities, the flanelinha is a fixture. Flanelinha (which loosely translates as flannel man, as in the rag) is the demure name given to the “workers” who divide the streets among themselves and charge drivers to park. Their excuse is that they’re taking care of your car. If you don’t pay up, a flat tire or a big scratch can be expected.