But making it an expectation for a job that has nothing to do with alcohol? Yeah no.
Alternatively: you should find a friend group that isn’t your coworkers if you want to have more selective control over who is “in” with your group.
Why not? I want my employee to fit in with the team. If they drink then I want someone who drinks. This is reasonable. There are subtle performance effects on the ENTIRE team when hiring someone too divergent.
As an employer I want my employees to all be friends. If I make this request in the job description I think that's perfectly fair. If I spring this request unknowingly onto someone who just got hired then it's unfair.
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...
My point is it is reasonable for an employer to LOOK for an employee with these characteristic qualities.
It is unreasonable for an employee to demand this behavior out of you when they didn't inform you up front that's what they hired you for.
So in other words, this kind of stuff needs to be put in the job description. It needs to be explicit. In that case it is fair.