Two weeks ago while boarding UA DEN-LAS I had a disagreement with the DEN gate agent about upgrading my girlfriend (She was ticketed with me but has no status – I’m Prem Exec and was #1 on the upgrade list). I never yelled at nor was I abusive to the agent, but I did ask her to call a supervisor and also called and had the agent speak with MileagePlus on the phone. Short version, MileagePlus took my side, onsite supervisor sided with the agent, and it ended with us deciding to take our original seats. Last week, flew DEN-ORD….but interestingly, I was nowhere to be found on the upgrade list, but my girlfriend, with no status, was #20. Might I have been blackballed for upgrades due to my disagreement with the DEN-LAS gate agent? If so, is this a permanent condition, and is there a solution?