If we’re talking about “stink,” the bias against Part 91 corporate pilots at the legacy airlines has ALWAYS been huge because of this continuing (mistaken) notion that corporate guys are “cowboys” with no appreciation or understanding of the crew resource concept.
After 21 years in the fractional world, I’ve flown with enough people of varying backgrounds to know that it rarely matters where they came from. Most have been great, some absolutely spectacular, and more than just a few have been ham-fisted morons. Didn’t really correlate to military, airline, or corporate.