I guess I think that most people begin to look on the chubby side long before BMI 25 so by the time they're actually there my eyeballs are still offended enough to mock them. Absolutely not as bad as someone morbidly obese, yeah, but still awful. It's easier for people on the borderline to make themselves look passable while clothed, especially women,  because they're still at the stage they can compress themselves back into the appearance of not being fat. It's a good ballpark for the majority of people. People who are around BMI 25 and fit enough not to be jiggly are a rarity, and they probably would never be posted here because people like that don't tend to actually look fat, but that's just my experience.  On the other side, I've seen plenty of squishy/skinny-fat people mocked on here that probably weren't technically past the BMI 25 mark but no one argues in their favor just because of that.  I don't see that many people being bothered on here for not being verified.  Personally I'd never verify for the doxxing reasons you've outlined.