Why is positive so negative?

This is an awesome video.  Nic Marks, a statistician, gives a positive presentation.

It was just uploaded to YouTube a few hours ago.  I clicked “Like,” along with 41 other people.  Four people gave it a thumbs down.  However, the comments are overwhelmingly negative.  People calling him “an idiot” and “a commie.”  People assigning labels, in a negative context, of “collectivism” and “a new world order.”

That’s not what I was hearing at all.

This tells me that positive ideas offend some people mightily — and those offended people tend to express themselves rather loudly (if not coherently).

The question is, am I now joining the cynical club, negating the quality of this message by bringing attention to the crackpot responses?