Like every organization, there are always bad apples. However, in general, I've found 90% of AA staff to be pleasant, helpful, and interested in making sure I have a good experience (in clubs, on board, etc.). When I encounter the rare one who isn't, I just assume s/he is having a bad day and let it go.
FWIW, I've also found the PSA flight attendants to also be among the best. More often than not, if I'm recognized for being an EP, it's from a PSA flight attendant.
All of my business travel is domestic, so I can't speak to TPAC or TATL as those tend to be more senior FAs or LODO FAs.