Hare Krsna,
Anger is not absent in the spiritual world. Everything that exists in the material world exists in the spiritual world but in a purest form. The perverted reflection of such things exists in the material realm being contaminated by the three modes of material nature.
Even though Bhagavad Gita 18.54 says:
brahma-bhūtaḥ prasannātmā
na śocati na kāṅkṣati
samaḥ sarveṣu bhūteṣu
mad-bhaktiṁ labhate parām
“One who is thus transcendentally situated at once realizes the Supreme Brahman and becomes fully joyful. He never laments or desires to have anything. He is equally disposed toward every living entity. In that state he attains pure devotional service unto Me.”
Here this verse says that one who is transcendentally situated does not lament. If this is the case, how was Mahaprabhu (Lord Caitanya who is none other than Lord Krsna – the Supreme Personality of Godhead), in the mood of Srimati Radharani, lamenting in separation from Krsna? How is it possible that the pure devotees of the Lord lament in separation from their Lord? How is it possible that Lord Damodara was crying when His mother Yasoda tied Him to the wooden grinding mortar? Didn’t Srila Prabhupada ever get angry?
The anger displayed by pure and self-realized souls situated in transcendence is also transcendental. Such pure emotions do not have any material tinge or duality such as hatred for the offending party. I am sure the anger displayed by the Kumaras is also transcendental. Their anger at Jaya and Vijaya is not mixed with the three gunas and thus their curse didn’t have any negative effect. Yes, Jaya and Vijaya, as a result, were cursed to go the material world. But this is not a curse but a blessing. It is done and planned inconceivably by the Supreme Lord for His pleasure (as we will see in later chapters).
“Therefore the theory that in the perfectional stage one should not have anger is not supported in this verse. Anger will continue even in the liberated stage. These four mendicant brothers, the Kumāras, were considered liberated persons, but still they were angry because they were restricted in their service to the Lord. The difference between the anger of an ordinary person and that of a liberated person is that an ordinary person becomes angry because his sense desires are not being fulfilled, whereas a liberated person like the Kumāras becomes angry when restricted in the discharge of duties for serving the Supreme Personality of Godhead.” (SB 3.15.31 purport)
Krsna Katha 