Theres a whole lot of people coming in and talking about fat shaming, but that has nothing to do with the OP.
This looks like a good sample size.
Anecdotally, it totally matches what I see when I visit my family who live in a lower income community where 95% of the people are overweight or obese. Because everyone around them is obese, being just overweight is considered healthy, and being healthy is considered underweight.
Doctor see this all the time with families. "How dare you say my child is overweight and needs less candy, she is perfect." No, your child is average. And in your community, average is obese.
Yeah, nobody is talking about the study. Anecdotally, I can confirm this. My BMI is around 26 and my chubby grandma always tells me that I'm too thin and that I need to eat more.