KhaledA - I train at Alliance in Atlanta, and I am sorry that you had such a negative experience. I can only say that as I read your description, that it was very surreal. I'm not doubting what you said, but what you are describing definitely isn't the norm.
First of all, the person you are talking about is not an instructor. That doesn't excuse anything that he did that you felt was inappropriate, but it is a very important distinction. I can assure you that Cobrinha would be very angry if he was aware of a situation as you describe it. If anything, Cobrinha is too strict for some people's liking (not mine, but some), and he is BIG on respect. Likewise, Jacare would not stand for the type of attitude or actions that you describe. I can only conclude that it was an anomoly.
I wish, for your sake, that you'd give the school another shot. I feel certain that you could not have the same kind of bad experience again, but maybe my standards are different than yours. Clearly, I'm biased, but there is no denying the numbers ... Alliance is one of the best school in the entire world ... and certainly the best in Atlanta. At least in terms of the technical and competitive aspects of jiu jitsu. However, I also believe that our environment is friendly, welcoming, and very professional. I can't say that I've ever met a nicer person or better instructor than Cobrinha .. not to mention the fact that he is the best jiu jitsu practicioner on the planet right now. Jacare is an amazing leader - his track record of individual and team world champions speaks for itself.
Of course, we have a lot of students across a wide range of ages, maturity, life experiences, etc. I'm sure that there are some individuals in a group that large and diverse who will rub anyone the wrong way. That will be a challenge whever you go. Personally, I wouldn't let the behavior of one individual in a single class affect a decision that big.
If you chose to try Alliance again, I'd avoid the person you had a bad experience with even though I think he is a good person. If there is anything you'd like to discuss, I'm happy to talk to you about my experience, provide advice about the school, or recommend training/warm up partners. If you chose to move on, best of luck in finding a school that fits your personality & needs.
Who are you? Were you there when I visited?
Just the fact that you stick up for your school speaks volumes but at the same time I'm hesitant to even bother going back.
Also...The fact that I mentioned I did no gi before the class, did that rub anyone wrong you think?
I can't stress enough how badly I wanted to join the team and get some great gi training but if those things are everyday problems I don't exactly want to push them aside.