UA 1669, IAH-DEN on 7/25 (still in air).
Flight attendant prioritized first class meal orders front to back after taking two GS orders. I was in the back and was stuck with shrimp salad, which I can't eat. I asked if 1Ks get prioritized first and she said absolutely not and that is the policy. She was the most horrible flight attendant I've had in years. She had 30 years with United and had a gigantic chip on her shoulder. What bugged me the most about this is I paid to upgrade because I was starving and needed dinner.
Maybe she realized she was wrong and it wasn't appropriate to yell at me - she stayed in the galley the rest of the flight.