FOUNDER-ACHARYA:HIS DIVINE GRACE AC BHAKTIVEDANTA SWAMI PRABHUPADA
Even you insult Krishna, He will tolerate. But if you insult His devotee, He will never tolerate. Then you are finished. Then you are finished. Just like a big man. If you insult him, he may think, "All right, let him." But if you insult or do something harm to his child, he will never tolerate. He will never tolerate. Similarly, a devotee who is dependent on Krishna in everything, and if somebody does harm to him, insults him, Krishna will never tolerate. That is explained in the Caitanya-caritamrta, vaisnava-aparadha. Tara madhye vaisnava-aparadha hati matta. So we should be very careful not to offend Vaisnava devotees. Not to offend. This is greatest offense.Srila Prabhupada
Lecture on: Srimad-Bhagavatam 1.15.22–23 — December 2, 1973, Los Angeles