But the people to whom you are referring aren't pilots so their criticism counts for zilch. I'm a musician by trade and used to gig an awful lot. You could almost guarantee at the end of the night you would be accosted by some guy who couldn't wait to tell you that the band had played such and such wrong. The instant shutter upper as I like to call it was to ask them when their band was next playing so that you could see how to do it properly. Of course, they didn't and had never played in a band.
There are people in all walks of life who gain a little knowledge and like to display how little they have.