It means, if you stultify someone (be it another human being, a company or whatever) you should be able to deal with other ppl stultifying you in return. If you can't handle a verbal exchange of blows, you shouldn't make jokes that provoke others to reply in the same manner.

Then what's the meaning of this? We never talked before prior to my initial response so how am I not 'being able to deal with other ppl stultifying me in return' when that was never the case so far? I stultified you then you responded as if I cried about you stultifying me in a comment that was never about that. This really makes no sense to me. Am I missing out on something cause I honestly don't see it? Or were you simply trying to warn me that if I talk shit about you, you'll do the same back? Cause to me, it all seemed as if I backed up on something and you were scolding me for speaking shit about others and not being able to deal with others returning that shit on me. That's how I perceived your message at least. Perhaps some language barrier here? Nonetheless, I'd like to hear the explanation, cause so far you're in the wrong to me and I like to think it's perhaps not like that.