That's true for every science-denier. It takes no time -- and no brains -- to say that "The moon landing was fake!" But to present sufficient evidence to persuade an audience that doesn't know one way or the other ... that requires lots of work. So the snappy debate forum with a layman audience is always preferred by charlatans.
The cost benefit ratio is much better for those churning out 30 second sound bites than for those putting forward well thought out responses. One takes little to no thought to consider, the other takes not just intensive thought but a large experience store on which to base the thought.
We all know which meme has a better chance of surviving and propagating.