Should I be annoyed?

A long time ago I decided not to expect any acknowledgment for doing a kind act, so I could just enjoy doing something nice without having it spoiled by getting annoyed.
In today's world this is the best way to think. It seems as time moves on the world is just getting more rude. How many folks still hold a door open for someone? Get the car door for the wife? Or even tell the waiter Thank You when they refill your coffee?