Nicole, that is a very interesting argument.
A agree with you that a sense of entitlement, no matter the background of the person feeling entitled, often leaves people and groups marginalized. I think most often the sense of entitlement comes from long years of perceived (or real) abuse or perceived (or real) privilege. Whether or not it is justified to feel entitled, I think the realization that a sense of entitlement will hurt you much sooner than help you would be great.
In any group that advocates size acceptance, there needs to be an acceptance of all sizes. I once went to a group of fat people’s meeting (agenda was mostly social, partly political, I guess) with my friend here in Cali. She was ridiculed as a size 16 and I remember her being really sad because in the “real” world she feels fat and she said that for the “fat” world she was not fat enough. I felt awful for her.
Your point is well-made.