Only way to fight nonsense is to publicly oppose it. And you can publicly opposite it only if you are well grounded in reading Prabhupada’s books, in this way, you will be able to recognize nonsense.
It is duty of every follower of A.C. Bhaktivedanta Swami Prabhupada to keep his teachings intact and pure. However, today, in Prabhupada’s own society, fighting deviant philosophy is pronounced criminal activity. It is taught to be “offensive”. This is so because corrupt leaders of Prabhupada’s society established such social norms. It is “not good” to fight nonsense and be straight forward, because that might “offend” fake gurus and their followers.