Technique: Claim that your opponent is doing what you are doing. Then, if your opponent retorts, claiming (accurately) that you are actually the one doing the thing that you accuse your opponent of doing, then you can simply claim that your opponent "has been caught red-handed and is now resorting to a childish game of 'I am not. You are!'" This is a tricky one but it has been used successfully numerous times in the past. As evidence, check out the keyword "Hypocrisy" in the "Ammo" section of this site. It is essentially a listing of examples of where this technique has been used successfully.