As already described, if certain kinds of mellows become mixed and there is a joining of opposite mellows, then the situation is called incompatible. When one is eating sweet rice and something salty or sour is mixed in, the mixture is not very tasteful, and it is called incompatible.
An exemplary instance of incompatibility is the following statement by an impersonalist who was lamenting aloud, "I have been attached simply to the impersonal Brahman feature, and I have passed my days uselessly in practicing trance. I have not given any proper attention to Śrī Kṛṣṇa, who is the source of the impersonal Brahman and who is the reservoir of all transcendental pleasures." In this statement there are traces of neutrality and conjugal love, and the resulting humor is incompatible.
Sometimes it is found in places like Vṛndāvana that a person with a slight devotional attitude of neutral love for Kṛṣṇa may immediately and artificially try to attain to the platform of conjugal love. But because of the incompatibility of neutrality and conjugal love, the person is found to fall from the standard of devotional service.
Incompatibility was expressed by a great devotee on the platform of neutrality when he sarcastically prayed, "I am very anxious to see Kṛṣṇa, the Supreme Personality of Godhead, who is many millions of times more affectionate than the pitṛs (forefathers) in the Pitṛ-loka, and who is always worshiped by the great demigods and sages. I am a little surprised, however, that although Kṛṣṇa is the husband of the goddess of fortune, His body is often marked with the nail pricks of ordinary society girls!" Here is an example of incompatibility due to a mixture of neutrality and high conjugal love.
There is the following statement by a gopī: "My dear Kṛṣṇa, the first thing You should do is just embrace me with Your strong arms. Then, my dear friend, I shall first smell Your head, and then I shall enjoy with You." This is an example of incompatibility in which conjugal love is the whole and servitorship is the part.
One devotee said, "My dear Kṛṣṇa, how can I address You as my son when You are addressed by the great Vedāntists as the absolute truth and by the Vaiṣṇavas who follow the principles of Nārada-pañcarātra as the Supreme Personality of Godhead? You are the same Supreme Person, so how shall my tongue be so extraordinarily bold as to address You as an ordinary son?" In this statement there is a mixture of neutrality and parental love, and the result is incompatible.