I don't think you helped your cause with your display. I think you created hostility to the whole thing by some where previously there may have been indifference at worst.
Hey, I can only point out to people that there is such a thing as earth hour being observed. As for helping my cause, it is not my cause, it is everybody’s cause.
At the end of the day, it is for us all to decide whether we are going to save the planet or whether we are going to destroy the civilization by our pollution, whether we are going to drown in our pollution (as they did on Easter Island, for instance).
So it is not my cause, it is everybody’s cause (or should be). If you say there is hostility, that didn’t do me any harm, if anything that will harm the planet.
After all, nothing will convince a rabid anti-environmentalist that we should protect the environment.