Fat people always think that "obese" is fatter than them.  You can have some 250 pound whale, and they'll probably tell you that "obese" is at least 300. Even in the very rare occasion that someone does admit that they're obese, they usually say "I'm technically obese" but then they follow up with how "BMI is a very inaccurate tool".  Every fat idiot in the world seems to think they have higher than average muscle mass and therefore BMI doesn't apply to them.