I am not a tech diver. I am sure I don't have the amount of dives that some of you have. I am an instructor and I do believe in the rule of thirds and also a minimum tank pressure at the end of the dive. I can understand the attitude that the captain might have given you probably set off the issue more than really asking about the amount of air after the dive, but if you are going to go on a tourist boat then why make a big deal about the rules. It frustrates me when I get on a boat and have people arguing with the crew about stuff. They have a job. They try to do it to the best of their ability. If it means checking for air pressure at the end then so be it. I guarantee if something happens to someone on the boat, they wouldn't hesitate to sue them. They are covering their own and hopefully the idiot diver's ass.