I have never felt "discriminated" against in the aviation community for never having flown with the airlines. In my company we have 30 airplanes and 70 pilots. Some of those that I work with come from Airlines, Air Force, Navy, Corporate and other backgrounds. Everyone brings different things to the table that we can all learn from.
It is a very tight group, and we all look at eachother as equals (that is hard to find in a department our size). What I am trying to say is that, even though a guy comes to us with 10,000 hours of 747 PIC time does NOT mean he will get hired. We look mostly at attitude, "Would I want to spend two weeks with this guy in Russia"?
As said before in the Corporate world Customer Service is EVERYTHING!!! You have DIRECT contact with the customers. I could see where some pilots (of all backgrounds) could have a problem with that.