When a Vaisnava is offended, the offender is punished by Visnu, the Supreme Lord. No one can protect such a person, even Lord Brahma or Lord Siva

Expressions researched:
"Therefore, when a Vaiṣṇava is offended, the offender is punished by Viṣṇu, the Supreme Lord. No one can protect such a person, even Lord Brahmā or Lord Śiva"

Srimad-Bhagavatam

SB Canto 9

The lesson to be derived from this narration concerning Mahārāja Ambarīṣa and Durvāsā Muni is that all the demigods, including Lord Brahmā and Lord Śiva, are under the control of Lord Viṣṇu. Therefore, when a Vaiṣṇava is offended, the offender is punished by Viṣṇu, the Supreme Lord. No one can protect such a person, even Lord Brahmā or Lord Śiva.

SB 9.4.71, Translation and Purport

O best of the brāhmaṇas, you should therefore go immediately to King Ambarīṣa, the son of Mahārāja Nābhāga. I wish you all good fortune. If you can satisfy Mahārāja Ambarīṣa, then there will be peace for you.

In this regard, Madhva Muni quotes from the Garuḍa Purāṇa:

brahmādi-bhakti-koṭy-aṁśād

aṁśo naivāmbarīṣake

naivanyasya cakrasyāpi

tathāpi harir īśvaraḥ

tātkālikopaceyatvāt

teṣāṁ yaśasa ādirāṭ

brahmādayaś ca tat-kīrtiṁ

vyañjayām āsur uttamām

mohanāya ca daityānāṁ

brahmāde nindanāya ca

anyārthaṁ ca svayaṁ viṣṇur

brahmādyāś ca nirāśiṣaḥ

mānuṣeṣūttamātvāc ca

teṣāṁ bhaktyādibhir guṇaiḥ

brahmāder viṣṇv-adhīnatva-

jñāpanāya ca kevalam

durvāsāś ca svayaṁ rudras

tathāpy anyāyām uktavān

tasyāpy anugrahārthāya

darpa-nāśārtham eva ca

The lesson to be derived from this narration concerning Mahārāja Ambarīṣa and Durvāsā Muni is that all the demigods, including Lord Brahmā and Lord Śiva, are under the control of Lord Viṣṇu. Therefore, when a Vaiṣṇava is offended, the offender is punished by Viṣṇu, the Supreme Lord. No one can protect such a person, even Lord Brahmā or Lord Śiva.