"It's a peaceful protest as long as you don't engage with it". This is you. What actual reason is there for society to find this kind of attitude acceptable or compelling?
Not sure what you expect here. If you become violent in response to provocation, you are still a peaceful protester (within some limit of violence, which surrounding a car so it can't move certainly fits with).
A non-peaceful protest is one where protesters actively attack people and property that are not engaging with them in any conceivable way.
A non-peaceful protest is one where protesters actively attack people and property that are not engaging with them in any conceivable way.