I just went through a slew of interviews where I got several questions early in the on-site technical interview about my hobbies. Actually had an interview a couple months ago where there was a dedicated part for a "cultural fit" interview. I think if I knew I was going to get hired it would likely be less of an issue for me, but I still think you should consider kind of what these kind of questions communicate in an interview context and how interviewees will be primed to answer them. "At will employment" generally means employers can choose to fire you or not hire you for an enormous number of petty reasons, and that knowledge is always shaping how I perform in an interview, and generally leads me to be pretty tight-lipped about anything about myself. I had an interview recently where an employee that was part of the hiring process was able to find out that I have left wing politics based on a github organization I was a part of. I didn't get that job and, like many companies, they weren't willing to provide their rationale, so I'll never know if that was an important factor.