I didn't take it to be demeaning, the fact is that the weight issue would play a large role in this incident. If the OP feels upset by it, by all means report it, but I don't feel it is up to us to decide what is insulting to others.
Maybe its because I'm not in the US and don't understand the mindset regarding when it is appropriate to talk about overweight, but I have always understood the role of friends to be to tell you the truth others won't. A BMI of 41 is a concern (in my mind) when it comes to diving. I am NOT saying they shouldn't dive, I am saying that there are additional concerns that need to be considered, like the incident being discussed.
If the OP were a friend, and came to me telling me the story, I would also tell him that I was concerned about his weight and the diving choices he is making. I am about 20 lbs over my target weight and I feel every one of them doing a surf entry with 2 tanks on, if I were 100 lbs overweight I wouldn't even attempt it.
Each to their own, YMMV etc etc etc.