"I think she'll look before changing lanes from now on."
I doubt it. She'd swerve the next time, too. It's great that you anticipated the move but I think her lasting impression will be that bikers are downright scary people. I don't know about the rest of the folks on this board but I would never, ever bang on a car. I see absolutely no value in it. You probably scared the woman to death.
But that's my opinion. I wonder: Would you have slapped it if a man were driving? The reaction may have been different.
As for my commute last Thursday before the holiday, it was great. It's a nice change to take the roadie every once in a while.