I'm very polite. I stand and wait my turn and hold doors open for people. And I say thank you, depending on who you ask I say it too much. But I've come to find that old people and teenagers are rude no matter what. I can't get either group to hold the door for me and they never say thank you when I do it. Little kids and adults are pretty polite though. I know I'm being general as there are nice teenagers and although very, very, very rare nice old people.