Re: It's getting annoying..
Unless you are an Academy Award level actor, you can bet the beginners can feel and sense your attitude. That doesn't create an environment where they will want to return and work hard to become better. They don't know enough to do you any favors and you certainly sound as if you're not doing them any favors. Either develop a positive attitude towards teaching them or give up on the teaching until you can show that kind of attitude.