This may not appeal to all and I don't know, being quite new here, if there is a special thread or if it is taboo. Anyway I found this passage from the discourses of Sri Nityananda vamsodbhav Sri Sukadev Goswami, kindly given in English by Advaitadasji.
Question: "It is written in the scriptures that the disciple commits an offence if he hears his guru being blasphemed. But if some person unknowingly uses words that slight or criticize someones guru, what should the disciple do then? Should the disciple hate that critical person and besome his enemy?"
Answer: "Look, the disciple who has given his whole heart to his guru has a very high esteem for his beloved deity Sri Gurudeva and worships him, placing on a very high level of ideal. If someone unknowingly uses words that criticize or slight his guru, the disciple should not get agitated or angry at all. First of all he should remind the critic with sweet words that he considers the person critcized to be his guru. If the critic does not stop despite this reminder, then the disciple must be very tolerant and stay calm even if the criticism is repeated once, twice or thrice. After that he should politely say with sweet words: "Dear sir, you are speaking all these unjustly critical words about my Sri Gurudeva; would you like it if I spoke such words about your Sri Gurudeva? If not, then please refrain from any more criticisms of my guru in my presence." Then if he still will not stop, the disciple will say: "Look, people in this world should help each other. If, by speaking such negative words, you destroy this faculty of support that there is between us, then will we not both lose? It is to be hoped that the critic will definitely stop after hearing these words. If even this does not work and the critic continues his slanderous and blasphamous campaign, then the final solution is - depending on the etiquette - to leave the place where the critic resides and go elsewhere, where this blasphemy of the guru does not have to be heard. But beware! You should not bear even the slightest malice toward the blasphemer or use any abusive words against him. If you do so you cannot understand the principle of universal love. The disciple must be very careful with this, that is why I am telling you this. Take care that you attitude of "more humble than a blade of grass" and "tolerant as a tree" does not deminish."
Wow! I thought this was right on. At first I thought he was going to say; If he still continues after that, off with his head. The whole book is a real gem.