Remember, alcohol reacts to the Drunken Master differently, a la the Drink Like A Demon class feature. I suppose a player can choose to ignore the effects via Diamond Body or take the consequence of the drink.
Diamond Body is great against poisons, but you forget the "extraordinarily embarrassed" clause. A particularly creul DM (i.e. me) would say "Diamond Body THIS!," not that I can think of anything off the top of my head.