Welcome to Y in the "new improved Delta" where many of us live some of the time.
I make it a point to acknowledge the good ones and not put up with the rude by making a comment to them when needed.
Amazing the difference in reaction I get
I always know are times when you need to give people room for bad days BUT on TATL flights you are stuck together for longer and I expect it to change at SOME point in the flight. Sometimes that happens when I make a point to mention to the FA what I observe. Don't get me wrong.. are some very nice DL FA's too!!

I do not expect them to treat me different as a DM in Y then any other passanger when it comes to attitude in general service on a flight.

I fly a lot on KL/AF as well and notice the difference in "general" service attitude.