What someone complains about can tell you a lot about them. It shows their assumptions.
For example, complaining about the fit of hospital gowns.
I mean, it’s understandable. They’re often overlarge drafty and billowy things.
But I have a hard time being sympathetic.
I can’t walk into a clothing store and assume there’s anything there that will fit me.
When I can find clothes that will fit, I’ll have a much smaller selection to choose from. I’ll probably end up paying quite a bit more, too. I had to look for about an hour online to find a hat in an okay color and style and that would fit… and it cost half again what the others cost, just because my hat size is outside the “normal” range. 
And those limitations also go for hospital scrubs and gowns.
Even with all the jokes about fat Americans, people of my size aren’t that common . It would be foolishly arrogant for me to expect a box store to fully stock things in my size, hoping they might be able to sell it one day. I take my own folding chair because I exceed the weight limits of most cheap ones. My bike is a super-heavy duty one, because I’ve had a wheel buckle under me.
You get the idea.
Because I don’t expect other people or facilities to accomodate me or my size automatically. It is not a default assumption, and that’s okay.
There are those people who refuse to recognize the reality of their body’s shape. Those people are idiots; pretending you’re a different size than you are isn’t body-positive, it’s self-shaming.
There are people who make fun of or are hurtful toward other people because of thier body’s shape and size. Those people are assholes.
But I would really like to have thinner folks – those people who are in the default range – to quit whining when their hospital gown doesn’t fit quite right, when I can’t find one at all.
Oh, one more thing.
That annoying thin person whining?
It may sound familiar.
It sounds a lot like straight people whining about Pride parades. Or like Karens and Chads whining that “All Lives Matter”. Or incels, or Sad Puppies, or Gamergate whining.
It’s the thin high-pitched whine of privilege.
The notes are a little different, but the melody’s the same.
 Yes, I just said I have a fat head. 🙂