I've known some bodybuilders who train in 'non-bodybuilding' gyms. In fact, I'd venture to say that most gyms are non-bodybuilding gyms. Most gyms are non-powerlifting gyms as well. The general public tends to frown on people who make them feel bad about themselves, so seeing someone at your gym looking like a bodybuilder, while it would inspire the typical T-Nationer, would make the typical Planet-Fitness Goes feel like crap.
Learn about training, and bust your ass no matter where you train. There's no magic gyms you have to go to. Hell, I've seen some amazing competitors who train in their garages.