Going to side with q konn on this one.
From wiki: https://en.wikipedia.org/wiki/Philosophic_burden_of_proof
And:
I would add to that to say that just because someone is asking for validation of a negative claim, it shouldn't be automatically assumed that they're advocating for it's opposite:
Bob the mechanic: What's wrong with this car?
Bill the mechanic: The carburetors aren't getting any gas.
Bob the mechanic: What makes you think the carburetors aren't getting any gas?
Bill the mechanic: Well, what makes you think that they are?
(that cars probably not going to get fixed anytime soon)