Simply phrase everything in a way that says exactly what you mean without actually saying it at all. It should be what you don't say that says your strongest points.
I'm genuinely an offensive often times vindictive person, but most don't realize it and so here I am! Not a scratch on me. By the time they understand they were insulted, I'm two towns away and pressing my luck elsewhere. I highly suggest it. It's best to live another day than to throw that punch you realllly want to throw but are uncertain you'll be able to walk away from. You know?? It's more entertaining that way anyway. Especially if you play dumb about doing it. Give it a try next time. The next post that makes your blood boil or that makes you feel whatever type of way..think of what you actually want to say, and then gift wrap it. Leave out the fighting words. Express your thoughts with intention and just a touch of insinuation. They'll arrive to both your point and your insults on their own, trust me.