Humility is very important in everyone’s life. It makes us realise equality among other people. Furthermore, modesty helps to create love, respect, and harmony in a society. Peace and harmony is an integral part of any civilised society.
In contrast, lack of humility make persons arrogant which is not pleasant for anyone in the society. Arrogant persons tend to think they are superior, as a result they expect lot respect from all other people. This behaviour will offend other people of the society. The offended people might quarrel verbally and physically also. Moreover, arrogant behaviour isolates persons from the society. So being arrogant is damaging to the arrogant person as well as the society where they live.
As far as dealing with egoist persons is concerned, firstly I would suggest them to think that they are like other people of the society. Everyone has got their own different talents, they not superior persons in the society. If the suggestion does work, (normally an egoist person does not take others recommendations) in that case, I will try not to keep relation with those persons. I think if those persons feel isolated, then they will realise mistakes. I do not have any problem keeping relation with them if they realise their mistake.