As Deb said - it's not about right versus left. What it is about is just being thoughtful on a daily basis, to those we don't know as well as those we do.

Would you ask the lady you hold the door open for if she is of the same political alliance as you and then let go the door if she isn't? More to the point, do you check, when you go through a door, whether someone is coming through after you and NOT let the door go in their face? Do you say "Thank you" when someone holds the door for you or when someone stops their car to let you cross the road?

We could all do with more common courtesy in our daily lives - maybe by taking the lead and thinking a little more about our effect on other people we might influence others to do the same. Sometimes it is not easy, but with practice maybe we can get better at doing it.