Good for you jaynee (and we need a cheering smilie here please!)
The more people pick on any out-group, the harder it becomes for people within that out-group to resist adopting a "fuck it, why should i bother?" attitude, bringing that stereotype closer to reality. The whole self-fulfilling thing.
I'm not saying this guy would have gone away and turned into a criminal or anything simplistic like that... but your actions will have played a valuable part in helping frame his view of that episode.
Most of us know that not everyone's out to get us, but it's still reassuring and sometimes necessary to actually experience the proof of that once in a while.
More eccentric old biddies (and old bastards!) please.