I think a lot of it has to do with a self perceived feeling of "high worth", measured by your ownership of something "special" and possession of a "special" skill, which cost you hundreds of thousands, if not millions of Rands, only to have that perception shattered by something "crude and basic" landing and parking next to you, flown by somebody that clearly does not fall into the same "class" as you do. Kind of takes that feeling of being "special" away - therefore the need to assert yourself by making belittling comments about the little toy that just ALSO landed here - at a fraction of the cost!. It explains to a certain degree the "Battles of Will and Self-righteousness" that commonly rage on another forum..
Sad thing is that these underlying ego's / self esteem /pride / etc. can also manifest in dangerous flying behavior - again - to re-assert selfworth.
Or in the need to try and blow the trikes parked near you over with your "Big Prop" as you do your run-up checks, as experienced by myself and some friends recently.
Guys, if you haven't read "Avoiding Fatal Flying Traps" - do it! It exposes and deals with these kinds of personality traits in general aviation, and shows you how easily they can become deadly to you and innocent pax.
Personally, I just laugh it of (except if you succeed in blowing my trike over - THEN there will be no laughing, only some big time bleeding...

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Dis maar die klein-tottie sindroom...