Welcome to PC
Yes, lecturing wouldn't sit well with me too. But did this T lecture alk2601? I didn't get the sense he did...
T can set up his/hers boundaries- like not going to session under influence and tell the client what will happen if they do- Not see you/terminate you if frequent...if he really "demands" you to be sober and feels he cannot work with you otherwise and you feel you can be 100% sober yet maybe it's time for a new T. But I think most Ts would be open to some sort of compromising here...I'd be very surprised if your T wouldn't...