I often let people in at the shops to pay for a few items if I have a thousand, lol! I have had it happen for me too. I also let people in on the road and I'm a pretty courteous driver, though that's not so common around here. People are just in such a state thinking about their own lives I think they forget that other people have their own problems too. I try to be mindful of other people.
I have tried to offer my free coffee voucher from Wiggles playland, more than one time, to people before when we were leaving and noone would take it! I offered it to several people too, lol! Only once has an elderly lady accepted it from me....
Sometimes, these days I think that because generosity and being openly nice to others is so rare that people are taken aback and automatically react in a negative way. I usually try to e gracious and accept if it's in my favour. After all it not aonly make you feel good that someone is being nice to you, it makes the other person feel good in helping!