On the other hand, ethics do not make sense in your worldview. That is the argument. If you condemn Hitler or say anything is intrinsically right or wrong you are not acting according to your worldview because a universal ethic is needed for this judgement. You do not have a universal ethic but rather a relative one which is nothing more than a preference with no basis. Atheists do not have a universal ethic but rather a relative one.
Relative ethics are nothing more than matters of taste or preference.
You can prove me wrong by showing how an atheist can use ethics in a rational manner. Or just explain how an atheist uses ethics to condemn someone's actions. I don't, again you are arguing my point. Just your personal preference. Hmm, I think it is more than a preference.