Or... you're not a potential drinking buddy. ;)
http://www.forbes.com/sites/susanadams/2012/12/03/employers-...
http://www.forbes.com/sites/susanadams/2012/12/03/employers-...
Which is why I try to avoid all types of personal questions as much as possible. I do not want to take if you like squash or knitting or beer into account when I evaluate you as a potential hire. So if i don't know, it can't subconsciously affect my opinion of you. I am interested in your job performance.