Those that are of great qualities and of a nature beyond comparison, who are learned and from a reputable family and who are renowned for their penance and Yoga, should always be respected, duly addressed and given seat without thought.
Shatanand explains that even one’s student (Shishya) should be given such honour if he displays such qualities (just as Swami Ramanand did with Swami Sahajanand).
Smruti explains, ‘Those with defect (blind, disabled, ill, unattractive) should never be ridiculed and called names which are inappropriate.’
Shatanand further explains that the way in which a person is addressed in private should never be used in public. If one calls another by a nickname in private then it should not be used in public as this is degrading. He should always be called in a proper manner.
Indeed all should be respected regardless of background, qualities, education etc for this is a great quality in man. They should never be verbally trodden upon as this could unintentionally hurt the person on the receiving end. It will also reflect on your own qualities as a person, undoubtedly leading to your unpopularity.