Yep. Doctors are people too and I think that they try to stay up with things as best they can but they are expected to have a really WIDE knowledge base so I don't usually expect them to know the ends and outs of these pretty niche specific procedures although with the way obesity is increasing I think they would do well to be more intimatly aquainted with them but its also important to realize that your average 300 pound person off the street hasn't really done the mental work to be a great candidate for WLS.
As for him commenting on bad choices in life, there are probably nicer ways to put that, but we all have to face the truth that no one ate their way to a BMI of 40 or 250+ without making bad choices on a fairly regular basis. It sucks, but thats what it is.
I'm glad he was open to discuss with you about it and realize that he was mistaken about the procedure you were looking for though, that doesnt happen often.