Why atheism always has a burden of proof

[Vincenzo Vinny G.]

Vinny, what you're doing would be like this:

Atheist: Christians think they can only get to heaven by drinking the blood of babies.
Christian: That's not true, we believe X, Y, and Z.
Atheist: Who cares what you say you believe? Christians think they can only get to heaven by drinking the blood of babies.

I can see that no matter how often it's going to be pointed out to you, you're going to keep believing in this wrong idea of what you think atheism is, so as I said there's no more reason to talk to you. You're being both willfully ignorant and arrogantly stubborn (or is that stubbornly arrogant?) and you're not willing to listen to us about what we really believe.

I'm quite happy to believe Merriam-Webster over "Doubting Thomas on the internet" who is trying to convince me that he is correct and the dictionary and other authoritative sources are wrong.

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Since atheism is only about not believing something and that is the concept you seem unable to grasp, belief is both highly relevant to the topic, and something you can't see the relevance of because of the blinders you're wearing.

I cannot believe your bullshit.

I guess you can think of me as a skeptic, waiting on you to meet your burden of proof.

Or something.