It is not possible to prove that *anything* does *not* exist. Even Bertrand Russell's celestial teapot.

As Karl Popper (or perhaps it was Hume originally) said..."it is not possible to prove that all swans are white; but to prove that not all swans are white, one needs to find only a single black swan."

Or as Carl Sagan put it, "the absence of evidence is not the evidence of absence".

So, I trust that no logical person will attempt to argue that some thing doesn't exist. Nor would they fall into the argumentum ad ignorantium and pretend that something must be true simply because it has not been disproven.

But questioned persons can speak for themselves of course.