Learn how to avoid Sidewalk Activists

It seems like there's more and more sidewalk activists, that somehow feel like they are better than everyone. The most common ones are: Greenpeace, Red Cross, Planned Parenthood, etc. Today I got harassed by a Greenpeace activist for like 30 mins, letting me know how much of an asshole I was being for not signing up, and giving my credit card number to a stranger on the street! I'm not against helping the environment, and homeless people, and all of that, but these organizations have to come up with a more efficient way of spreading their message, than having annoying hippies stopping people on the sidewalk. Anyway, these are some of my moves to avoid them. Although my favorite move has been to harass them back with my own business cards to see if they want to join my cause.