I share a bit of that experience when trying to make Chinese friends. The first place I lived was with a family who had a son around my age. He was solely interested in practicing English but he had virtually no life outside of school.

I moved into a foreign students dorm and most of my classmates were Korean and Japanese, but I spoke to them in Chinese. The friend I hung out with the most was Korean and I didn't feel like there was a gap in hobbies. We had a group that would go out and play pool, drink soju, and sing KTV. I never had good opportunities to meet and hangout with other Chinese students. When people go to bars, they really don't go and socialize with others. Socializing is usually contained to the group you are in.

I think I'd say though there is still a big advantage in just being able to converse with taxi drivers, retail workers, etc. People are pretty chatty because westerners speaking Chinese is kind of novel. It is a great way to better understand what I consider a fairly misunderstood country.