- Why did everyone start to hate the Russians if the U.S. did the same thing in Afghanistan, Iraq?
- What needs to be corrected in the management of Russia first?
- Why did Blaise Pascal become a religious man at the end of his life?
- How do I know if a guy likes you?
- When they say "one generation", how many do they mean?
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.