I was on a US flight from DCA in F and apparently the gate crew started boarding too early; the FAs were finishing up their contract mandated meal time and weren't ready for boarding. Towards the end of the boarding process the two of the FAs were in the forward galley and were complaining about it and they spoke rather harshly to the gate agent about this. I understand the FAs were not happy but do not complain and berate your fellow employees in front of paying passengers; file a grievence with your union rep and HQ later.

Ironically the FA in F that day was one of the better FAs I have had in US.