Yesterday flying ORD/MIA one of the FAs, young guy, had on about 5 recent flights in F. Always PDB and drinks offered in flight. This time he's working Y but after we get in flight he leans over and tells me he's going to try to get the F FA to serve pasx but the F FA is a 30 year veteran "set in his ways." Well apparently the "30 year veteran" refuses to do a service and sits there with a scowl on his face. Finally the number 2 puts on an apron and breaks open the F beverage cart to do drinks. Only then does the "30 year veteran" jump in and do the service. Unfortunately come 10/1 the "30 year veteran" will likely have a job, along with a bad attitude, while the young guy will be collecting unemployment. Complaining to AA isn't going to do anything. I believer Parker will use these silly "health concerns" to move AA more towards Spirit.