He just using the old “Argument from Authority” logical fallacy. I’ve worked with tons of people, even those that did in fact “know their stuff”, that thought it was perfectly valid to dismiss others because of their experience being more extensive than others. Ironically, after I’d prove these people wrong in serious matters (usually several times), I somehow got added to the nebulous authority whitelist in their head. I don’t want to just be believed became I’m dammit, believe me when I’m correct and provide evidence!