I wasn't saying that I do or that anyone ought to accept obesity as normal. However, in my country (I'm an American) it is prevalent. I'm overweight (though not obese) too. It's not that weird to view it as typical. The word "norm" can be construed in a lot of ways. In one sense it just means typical or average or median. In another sense it means normative or preferred. I think we know what sense of the word we're dealing with here though.
Obesity is a statistical trend in America. 2/3rds of Americans are "overweight" or "obese"[0] according to widely used metrics.
[0] - https://www.niddk.nih.gov/health-information/health-statisti...