But, they aren't healthy. At all.
At those sizes little things in life are incredibly difficult for them, how the hell do they think that's good? Fat bro here (45lbs down, a lot more to go), I couldn't even do a flight of stairs in my own home without breathing heavier, and most of these people are my size or bigger. Fuck this fat acceptance, I was dumb enough to believe, "growing boys need to eat" and, "you'll grow into it" until I was 16 and realize it's bullshit. You don't grow into it, you work for it.
Being big isn't beautiful or healthy. Your fat isn't who you are as a person, it's not what defines you, your actions do. Striving to make people accept you for your weight just tells the world, "Yup, here I am, fat. Nothing else."