Maybe, they were trying to show their superiority. As, now also in India many people don't consider the person equal to them who is serving them. 
The only advise I would like to give them is that we must have the curtsy and so called Sankara in us, as they determine our real knowledge and status in society.
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I will say them or ask them that u behave like this only with your parents absolutely no we not behave like this because they are elder so why u r behaving like this driver he is also elder.
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