I may have quoted your post and made a broad based comment, but it was not to single you out, rather to extend the conversation around "average" and/or "healthy" weight and how obesity (and being overweight) have impacted things like sizes of jeans (the current subject).
To remark on never seeing someone, you are correct, I have never seen what your husband looks like. However, there are some determining factors that can be used, and I even ensured I mentioned that BMI can be impacted by those who are muscular/atheletic (which usually results in smaller waist sizes until you get to some very muscular builds).
Unfortunately, people take a lot of offense and prefer to not talk frank about things like weight, BMI, etc, so I can understand you may be offended, but again, it wasn't meant as an "attack" or to be offensive. Rather it was more about being open about discussing serious issues and how it relates to the topic at hand.