You beat me to the punch as the paragraph before this has me thinking that for those who wield the ability to oppress, identities shine a light on their behaviors. As you detailed in your piece, identities allow for us to better parse out the conditions people live in and their experiences. If "fat" is such a bad word, how did it get to be so? If people had to develop new terms like "Thick" or "Curvy," that means that non-fat people created conditions so harrowing it forced people to try and shake off an identity.
Why are any of us oppressed in the first place?
Edit: I read further and you said the same thing I said, whoopsy, either way thank you for writing!