It is one of the major sins when a man abuses his parents. It was asked: "Would a man ever abuse his parents?" He replied: ""Yes. He abuses the father of another man, who in return abuses his father, and he abuses his mother, and so the latter abuses the former’s mother. [Al-Bukhari]

«من الكبائر شَتْمُ الرجل والديه» قيل: وهل يسبّ الرجل والديه؟ قال: «نعم، يسبّ أبا الرجل فيسبّ أباه، ويسبّ أمّه، فيسبّ أمّه». (البخاري)