I think biking is a whole body experience. You get your descriptions of bike fits and legs and arm reach, you get your discussion of how to ride, and the mind is included in discussions of law and bike philosophy. Since it is a whole body experience it is only natural that you will find some a-holes. They seem to feel as if they have to disparage any comments not reflecting the company line as they have judged it.
Ignore them, don't let them bully you out of any forum, and feel sorry for them. Anyone who puts you down in an elitist manner is trying to raise themselves up by putting you down, which means they secretly don't think much of themselves.

Fortunately in both forums and in reality, an a-hole is but a small fraction of anatomy. Go where your interest takes you, there are many who bike for the joy of it, and are here to help others and enjoy the companionship of fellow bike riders.