When dealing with people, don't forget to consider yourself, do what makes you happy, and then do what makes others happy.
Although there are some selfish elements in this view of things. However, properly protecting your rights can serve others for a longer time.
However, if you want to please yourself first, then please others, then this person is too mean and selfish. Faced with the conflict between personal interests and collective interests, such people will inevitably abandon others.