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Purposefully backstabbing after informally agreeing to compromise would then be considered obnoxious, but always considered within the realm of possibility. You'd just probably have to offer something really nice before the backstabbee would consider doing anything nice for you again.
Source: wiktionary
One of my thief characters ended up with one of these rings as his sole magic item (at level 7 at the time). He always wore it on his sword hand, and anytime he made a backstab, would trigger the ring as well. The ring description states that the charge can be directed down a conductor, so the charge goes down the ring into the backstabbee.
Source: wiktionary
Certainly some trashings have consequences, especially from people in power and from those who aim and succeed at turning others against you. But experience tells me the average backstabber reliably comes out worse in the end than the backstabbee.
Source: wiktionary