Not everyone is like that though. We are very numerous, a good 50 people and I do learn a lot from some of them. My Sensei is the best I have seen (I ever had three). A few rotten apples are bothersome but should not denounce the entire tree.
I would be careful when judging the entire dojo or the teacher based simply on the students.
Well, we are judging based on your posts... anyway, If Sensei can't control those rotten apples then do it yourself. I've found personally a good old school ganseki otoshi makes people to reconsider their disruptive attitude.
So, I'd suggest to you to stop whinning and pump some iron.