That's a blanket statement that certainly does not cover all ideas that happen to be against the mainstream. Yes, there's a lot of nonsense, and plenty of argumentative fanatics, but occasionally you get enough tiny flecks of gold in the mudslides of woo-woo to make it worthwhile.

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
"The Mayan symbol for "book" looks a lot like a triple hamburger, but I've never seen them claiming it as proof the Mayans had Big Macs." - KaiYeves
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort