By talking about others (which is a perverted reflection of the soul's natural propensity for talking about Krishna), we create enmity because nobody likes to hear that others are talking about them, either indifferently or especially negatively. The soul's nature is to be always speaking about Krishna. When speaking about others , we should always speak in a positive way that is related to Krishna's serrvice. Every soul's propensity is to be engaged in Krishna's service and encouraged by others for the service they render to Krishna. To speak about others for any other purpose is simply an uncontrolled urge to speak unnecessarily. Better we do not speak.
Collected Letters to Friends and disciples Vol 5, Pg 118, last paragraph.