WHY DO SOME PEOPLE FIND IT HARD TO SAY THANK YOU?

It is common among children of the 1980's and after to find it hard to say thank you.  It disturbs to see that you can do a service for someone, and he/she finds it not worthy to say 'thank you.' I for one, I even say thank you to these taxi drivers, because they are able to hold you safe during that time you are in their hands.

‘Thank You’ Is More than Just Good Manners
"Thank you" can be an incredibly powerful pair of words, especially if the person you're thanking really needs to hear them, or isn't expecting them.
Why are expressions of gratitude important?
•    Good manners are a code of conduct or rules, based on common sense, courtesy and usage. Gratitude is one of these rules.
•    Since we were children, we have known that some situations require an expression of gratitude e.g. birthday gift.
•    here have always been ungrateful people but this doesn’t mean that we are all ungrateful.
It is important to say thank you because:
•    We recognize that someone had a choice – they didn’t have to send us a gift. We are not entitled to a gift.
•    Saying thank you acknowledges our dependence on others. No man is an island.
•    We should appreciate the act of giving and the time it took to think of the gift, buy it and wrap it.
•    It is important to recognize the time it took, especially because we are a time deprived society.
•    We acknowledge our relationship with the giver. It’s a simple sign of respect.
•    If we do not express gratitude, our relationship might change because we show we don’t care about the other person.
•    People give gifts because they are looking for recognition, respect and affection.
•    If we are not thanked, we worry our gift was meaningless. By demeaning the gift, we demean the giver.
•    By undermining the code of conduct, we belittle the worth of others. What we are saying is: I don’t have to thank you because you mean nothing to me.
•    It is contagious. If you do something nice for someone, they will do something nice for someone else.
•    If we start chipping away at gratitude and common courtesy, life becomes very unpleasant.