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Clearly we need to discriminate against overweight people equally. It's not fair that hispanic women, black women, and all men are getting a free ride here.
I'm kidding, of course.
However, given that there is no acceptable form of discrimination, in the big picture this is discrimination that affects a small group which can avoid the discrimination by losing the weight, and consequently becoming healthier and living longer lives. All discrimination is bad, but at least this is something people have control over.