Comment by zahlman

> But as a hint, it's pretty easy to deny existence when you dehumanize someone.

This has the logic backwards, and is also playing semantic games with the meaning of "deny existence". We're talking about a claim that someone already does not exist (which is why people think it's absurd: they're often actively having a conversation with the person they're falsely accused of believing not to exist), not the act of causing someone to cease to exist (an imprecise, colloquial way of referring to murder).