Srila Prabhupada…”Tṛṇād api sunīcena does not mean that if a Vaiṣṇava is insulted or Viṣṇu is defamed, you remain silent, “I am tṛṇād api sunīcena.” No. At that time you should become fire. That is the teaching of Śrī Caitanya Mahāprabhu. Just like Hanumānjī, he’s Vaiṣṇava. But when there was need for the service of Lord Rāmacandra, he set fire in the Lanka. So when there is viṣṇu-vaiṣṇava-ninda, defamation, you should not remain tṛṇād api sunīcena. You should take steps. This is the instruction. Anyway, Vaiṣṇava is never angry, but that does not mean that you tolerate insult to Viṣṇu and Vaiṣṇava. No.”

Srila Prabhupada’s Lecture : Srimad-Bhagavatam 5.5.3 — Vrndavana, October 25, 1976