debate your imagination

In political debates, when someone asserts an opinion that cannot be supported by evidence--usually something that has been debunked by fact-checkers for several years and is often in Alex Jones territory--we should respond that we're not obligated to "debate your imagination".

You claimed President Obama is a Muslim born in Kenya as a Manchurian Candidate in order to ruin the Constitution, confiscate all guns, lock up Christians in FEMA camps, and usher in the reign of the Anti-Christ, but you haven't shown evidence that it is a reality that exists outside your own head. Why do you think we're required to debate your imagination?