I just read the reviews, just for kicks. The negative I read really angered me. I have been an "annual" member for years, since Sumit opened his doors. I can tell you, he has been the kindest, most understanding person I have ever met. He must have a reason to get upset at you, I have heard him refuse a client and I completely understood. I think it must take a lot to make him angry. (EVEN, I don't smell good after 70 minutes of Hot Yoga!)
David is an excellent instructor. He wants you to get the most out of your yoga. YES, it is rude to be late, and you were rude in the comments you made to him, no wonder he was on the defensive. He is also a kind person. He has helped me a lot.
I had a girl (who was an employee) tell me that maybe hot yoga was not for me, but I was reassured by Sumit, and many of the instructors, including David... I am where I need to be and they understand my position, and to continue trying hard. I have a chronic illness, and I will miss a few weeks, but when I come back it is the same warm, welcoming place. I only have a problem with the disrespectful people who attend the classes, coming late, talking, leaving early, etc.
I will be a member as long as Sumit and I are in the area!