I'm not at your company to have fun. Beyond a paycheck, job satisfaction and personal growth would be nice, but surfing, nerf guns, pinball etc are things I'd prefer to do in my spare time with friends and family, thanks.
Sure, the annual company retreat or Christmas party are expected, but there's nothing worse than a bunch of co-workers trying to have "fun" because it's an unspoken requirement of the company culture.
What I'm asking about is ”De facto”. If practically, you are letting go of people who can't or won't surf with you on the weekends because of ”culture fit issues”, surfing becomes a de facto (but not de jure) requirement of the job. And the reason I'm asking about it is that it has been mentioned as one of the four points related to letting this employee go. Otherwise, why is it even in the response? Notice that it is not part of the advertisement (which comes later, outside the points).
In Asia on the other hand, it literally is mandatory to socialize with your employer.
Maybe I'm reading too much into your comment, but are you saying that enjoying surfing is a necessary part of your company's “culture fit”?
If someone is physically or otherwise disabled or unable to participate, does that preclude them from being a part of your company?