Basically it's just like, if you're my enemy, if you're my rival -- if you're not my friend, if you're not in my family -- I'm much less inclined to apply the golden rule to you.
que básicamente se reduce a si eres mi enemigo, si eres mi rival, si no eres mi amigo, si no formas parte de mi familia estaré mucho menos inclinado a aplicarte la regla de oro.