man up and do it.
I don't understand responses like this...
His employer is demanding that he reduce his quality of life, for no real financial reward. To accept would not be "manning up", it would be meekly accepting the demands of the employer. If anything, it's the opposite of "manning up" - it's a loss of self respect.
The "manly" thing to do would be to refuse, and seek employment elsewhere. But of course, life does not always allow for such luxuries as maintaining dignity in this way... We all need to eat.