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How to deal with ungrateful people
Look at the situation from their perspective.
Sometimes other people don't always see how much time and energy goes into helping them. Instead of thinking about what you've done, think about what your customers or coworkers can actually see.
Are they able to see how much work you've done to help them? If people don't know what you've done to help, they can't be expected to show their appreciation. Sometimes it's part of any role that you have to put in effort without seeing immediate reward.