sarpanam iva durnayam
na tam vyabhajad acyutah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Demons are by nature crooked like snakes. Therefore, to distribute a share of the nectar to them was not at all feasible, since this would be as dangerous as supplying milk to a snake. Considering this, the Supreme Personality of Godhead, who never falls down, did not deliver a share of nectar to the demons.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
It is said, sarpah krurah khalah krurah sarpat kruratarah khalah: “The snake is very crooked and envious, and so also is a person like a demon.” Mantrausadhi-vasah sarpah khalah kena nivaryate: “One can bring a snake under control with mantras, herbs and drugs, but an envious and crooked person cannot be brought under control by any means.” Considering this logic, the Supreme Personality of Godhead thought it unwise to distribute nectar to the demons.