If it is as bad as you claim, I really don't understand the issue. There is no need to discuss anything with anybody. Just leave. Find somewhere else to train. You don't need to "fix" them. You just need to find someplace you feel comfortable and clearly this ain't the place.
I've gone to places to learn, tried it for a while, but left feeling it just didn't click for me for any number of reasons. You don't have to justify or explain your reasons.
Heck, we have students that seem promising who one day just stop coming. We try to follow up if it is really jarring, but the reality is that people have busy lives and varied interests. Things change, focus changes, interests vary, and there is no reason to stay someplace if it isn't what you like.