Why is there no more common curteousy or decency anymore?

It seems that all of our morals and lessons have gone bye-bye. I cant even give the cashier at the grocery store a coupon without her rolling her eyes as if I've put her out! People dont look at you in the eye anymore, let alone smile or say hello. I wish for a kinder gentler world. Please reinforce my beliefs that there might still be some kind people out there.