Have you encounter such people in life in which no matter of what good you have done to them, they will never appreciate such and show gratitude, helping them even will be seen as your own responsibility to do so, while they were there no helping other from their own little capacity, this is about pride to me, i see no reason for someone to help you out with something and then you refused to show your gratitude, will you be able to receive more for the next time?
In fact, in life we will always find people who are ungrateful and do not support each other. This may be a matter of people not appreciating people's performance towards each other which may be for personal or work interests, which creates a greedy and ungrateful nature.
This scenario or process is what we find, people who lack respect, colleagues who do not support each other, or bosses who do not appreciate their employees' performance.
it will hurt when our performance is not appreciated.