अहङ्कारं बलं दर्पं कामं क्रोधं च संश्रिताः।मामात्मपरदेहेषु प्रद्विषन्तोऽभ्यसूयकाः॥
ahankāraṃ balaṃ darpaṃ kāmaṃ krodhaṃ ca sanśritāḥmām ātma-para-deheṣu pradviṣanto ’bhyasūyakāḥ
Word by word
The verse says
Leaning on self-importance, on force, on swagger, on wanting and anger, they resent me - in their own bodies and in everyone else's.
In plain words
This is the hardest line in the chapter and it is easy to read straight past.
They resent him in their own bodies. Not only in other people. In themselves.
The self-importance is not self-love. Krishna is saying that the man who cannot bear anybody cannot bear himself either, and that these are the same refusal.
Where you've felt this · in family life
Your uncle is hardest on your cousin for exactly the thing he cannot stand about his own life - the job he settled for, the thing he never finished. Everyone in the family can see it except the two of them. He is not being cruel to a boy. He is being cruel to something, and the boy is where it is reaching.
Going deeper
Resentment aimed outward and resentment aimed inward are named here as one thing, and that is the deepest claim in the chapter.
The divine is resented in their own bodies and in others. Not one or the other. Chapter 15 placed a fragment of that divine in every living being, which means contempt for people and contempt for yourself are a single gesture pointed in two directions.
This explains something you can watch without any philosophy at all. The people who are hardest on everyone around them are almost never at peace in private. We tend to read that as hypocrisy. It is closer to consistency.
So this is not asking you to be kinder to people as a favour to them. It is pointing out that the faculty is shared. You do not get to run one standard for others and a gentler one for yourself, and nobody has ever managed it for long.