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If the argument is scientific, the propounder of a theory takes on the burden of proving it, and he must prove himself right, not you.
There are many theories that do not satisfy the principle of falsifiability, that is, they are basically impossible to refute, even if they are wrong, and they are often considered unscientific precisely because of this. These theories are considered incorrect by the scientific community “by default”.
In general, you don't have to prove the negation.