I think that statement was a bit harsh,
Seeing as the supernatural can neither be proven nor disproved, take into account that the "current laws of physics" can only take into account that which is known, which is only "current knowledge" otherwise there would never have been any changes to what we "know" and "have known" throughout time, then only an idiot would say to someone they are an idiot for believing in something to which they themselves cannot disprove.... Millions of people believe in God, yet there is no scientific evidence to prove his/her existence, even though God does not conform to any physical, biological or scientific laws of fact, but still, the existence of God cannot be disproved.. and there again, people who believe in God are not idiots.