An interesting book. In it, the author was goaded by some yobs while he was with his small son. He, rightly, didn't rise to it and walked on instead, as far as I remember. It's a common game with the yobs; to stop some man and make some gestures or throw something at him. Anyway, as he had his small son with him at the time, discretion was the better part of valour here and he made the right choice. Sometimes the yobs make the cardinal mistake of goading the victim too far and he counter attacks; see Vietnam Tom on the internet for an example.