I sympathise with the OP. I work mostly in theatres where there are usually a dozen guys auditioning for one spot. You have to develope a thick skin, which isn't always easy. I do this for a living, so it's also not just about hurt pride.
On one occasion, not only did I not get the gig, but when the guy who [i]did[/i] get it wanted me as a sub, he was told that I was on a blacklist that the musical supervisor (who was only there for the auditions and didn't work in the theatre) had of guys who shouldn't even sub on the production. This stuck in my craw for several years until I was asked to audition for another show in the same house as a sub. I got in and, over the following years, got to hear loads of stories about what a kn#b the musical supervisor was, how his decision-making process was totally flawed and how some of the other guys that also landed on the blacklist had been playing in that house for years in numerous productions. None of the guys in the band, including the MD, understood why any of us had been blacklisted.
I know it's something of a platitude, but try not to let it get to you. Very often the reasons are so banal and have little or nothing to do with the playing.