Two kids on BMX bikes were on the jail trail late one night trying to knock people off their bikes.
I was restless so I just went out to ride some laps. The first time I went by it was subtle and I tried to write it off as a mistake. On my way back they did it again only more obvious and there was no doubt that they were trying to hurt me.
You have to let words roll off your back, but, personally, once things get physical I think you have a responsibility to react.