I disagree that it has to be a USAG gym. While the USAG website can be helpful, their safety guidelines and coaching certifications are a money making joke. I've taken the course and it focuses more on how to avoid a lawsuit. Also, USAG is very selective about which coaches they call out for abuse. Like everything, politics plays heavily and while they may point out some not great coaches, they also sweep allegations against winning coaches under the rug.
There's nothing wrong with an AAU or YMCA program whether or not you're looking for a competitive program. I know many good coaches in those programs that can easily coach in a USAG gym, but don't agree with USAG's philosophy. I competed and judged USAG - it was fine for me, but it's expensive, it's hard to be successful at, and it's hard to juggle other activities if that is a priority. Plus, I guarantee the gym the OP saw the quote at was a USAG gym.