AS long as dairy is not making you sick, then it is no different than many of the other foods that are not good for humans. MODERATION is the key to the diet.
I have known people that drink 2-3 gallons of milk every day and those types are normally bad diabetics. WE humans should never drink more than 1-2 quarts of anything per day and even in the hottest of summer working hard---1 gallon of water is allot.