>Why not? I want my employee to fit in with the team. If they drink then I want someone who drinks. This is reasonable.

In what universe? Sorry, but only a sociopathic boss would consider this "reasonable".

In fact, if what you wrote as "reasonable" was explicitly stated as an expectation in company communications, the company could be sued out of existence, and would surely could Twitter-red out of business too, and any team manager in a larger company would be fired with the compamny trying to disassociate with it as much as possible...