Taste One's Own Poison
In your lifetime, you have probably met people like this: you did something to them what they didn't like, and they did the same thing to you to teach you a lesson. This is quite the opposite of ethical fairness, either in the sense of “don't do onto others what you don't desire,” or “do onto others what you'd like them to do for you.” Here, letting someone tasting one's own poison is, quite frankly, to do onto others what you don't desire.
They might tell you it's for teaching you a lesson, that it's for your own good, and honesty is what a friend is for. But they aren't your friends. The argument is hypocritical, and here is why:
- They are willing to treat you the same way, which means they have no higher moral ground to judge you.
- They already know the behavior is harmful by their judgment, and their willingness to inflict harm onto others only shows their vindictive nature.
- Honesty is achieved through healthy communication, not by inflicting harm which shuts off communication.
Furthermore, anyone who deflects other's own poison is worse than the original perpetrator because the original person might not realize it's wrong, but the deflector clearly does. There is no excuse to justify knowing something is wrong and still do it.
Jesus said to them, “If you were blind, you would have no guilt; but now that you say, ‘We see,’ your guilt remains.——John 9:41
There is no way to tell what else they would be willing to do to harm others because they are always willing to go as low as they need to be. That's why it's extremely dangerous to associate with people like that.
Some people resort to this type of retaliation because they're unable to articulate why they felt hurt by what you did to them.