I dont think it's the product of my imagination that you are slightly over confident in yourself and your beliefs and somewhat dismissive of others and theirs.

Whilst I think you are probably a decent chap taken in the round I find your approach to be narcissistic; akin to several people I know in person.  This trait might be the product of an over praising mother, who knows, but I think this rubs people up the wrong way. I suspect you are largely unaware of this (or maybe dont think it's obvious) so you are puzzled by people's reactions.  The natural response for a narcissist would be to dismiss it as jealousy or stupidity....

Anyone who claims to have buddhism nailed needs to take stock of things IMO.