[MHGinTN]

You are excused. If you actually believe you could be my teacher given your condition steeped in the religion of catholiciism blasphemies rather than Christianity, then we really have no basis for discussion. I would not be a child before an agent of dissonance. You are excused, we need go no further, pseudo-master.

[af_vet_1981]

Backbiting, backstabbing, or tale-bearing is to slander someone in their absence — to bite them behind their back. Originally, backbiting referred to an unsporting attack from the rear in the blood sport of bearbaiting.[1]

... Thomas Aquinas classified it as a mortal sin, but considered it to be the gravest sin that one could commit against one's neighbour.[3] Islam considers it to be a major sin and the Qur'an compares it to the abhorrent act of eating the flesh of one's dead brother.[4]

In Judaism, backbiting is known as Lashon HaRa (the evil tongue) and it is considered a sin based on the verse in Psalms 34:14: "Stop your tongue from evil; and your lips from iniquity."

...

Causes[edit] Backbiting may occur as a form of release after a confrontation. By insulting the opposing person, the backbiter diminishes them and, by doing so, restores their own self-esteem. A bond may also be established with the confidante if they are receptive to the hostile comment. Such gossip is common in human society as people seek to divert blame and establish their place in the dominance hierarchy.[6] But the backbiting may be perceived as a form of delinquent behaviour due to an inferiority complex.[7]