There's a right way and a wrong way to present rebuttals of accusations. Going off half cocked and screaming at the top of your lungs "It wasn't me! I didn't do it! I'm innocent! It's lies and slander!" on a public message board is not the proper way to do it.
Trust me, PETA spent months and probably millions of dollars setting everything up to make a video. Give Ari time to present his side of things when he's ready to do so.
If it was me they were slandering I'd not respond to anything for a few months at least. I'd wait until the emotional outbursts and anger had run their course and then I'd take apart the lies and slander. At my own pace, in my own time. But that's just me. Maybe you'd rush to the nearest mountain top to declare your innocence?