Fine if it was decided before the start. Not exactly very pleased but FINE, I'll do it and will aim to be less of a bitch about it.
But to go overboard and assume I will continue covering for everyone, I have every right to be angry. This is not the way. You can't have like everyone relaxing then someone working very hard. What is up with that!

I am not happy and will proceed to be a bitch about that.
Don't try and stop me if I were to start a quarrel. I will. I'm not afraid!