For me, people who are eager to show their contempt for any sort of non-mainstream theory are probably trying to get approval out of it. They want people to think they're sensible, respectable, rational, without having to go to the trouble of actually reasoning.

Just look up the orthodox belief, and tell everybody you believe it without question, and mock anyone who ever questions it. That makes you rational. In this case, call them drug-addicts.

OP even quickly admitted he'd falsified/misrepresented the claims. But that makes him rational, because only loonies question what they're told about Bigfoot.

Easy to see what they're getting out of it.