One can prove a negative.
Obviously one cannot prove a negative of universal scope...just as one cannot prove a positive of universal scope.
Let me ask you this:
Is "There are no gods" a negative? If I could prove that there are no gods...would I be proving a negative?
Sub in : Are "There are no any of the most stupid, ludicrous things imaginable and inimical by definition to everything humanity has ever learned residing in some other reality or supplanted upon our own" a negative? If I could prove There are no any of the most stupid, ludicrous things imaginable and inimical by definition to everything humanity has ever learned residing in some other reality or supplanted upon our own" would I be proving a negative?