Hazrat Moulana Ashraf Ali Thanwi (rahmatullahi ‘alaih) once mentioned:

It is compulsory upon a person to learn the etiquettes of being a human being and how to conduct oneself with people. If one does not learn this, one will be a means of inconvenience and distress being caused to people. As a result, one will have to bear the evil consequence in the Hereafter. (Malfoozaat Hakeemul Ummat 8/265)

Source: Ihyaauddeen.co.za