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Fat-shaming is harmful. Fat-shaming is counter-intuitive to the supposed intent of the shamer. Fat-shaming is wrong. It is not, however, "just like racism." Fat amounts can fluctuate. A thin person can once have been fat, and can become fat again. A fat person can once have been thin, and can become thin again. For some, this can happen because that's just what someone's body is inclined to do at certain times in their life, while others may find they are able to make changes through changes in diet and exercise; others still may do so through surgery. This does not necessarily mean that they SHOULD do these things - simply that it is possible. Race CANNOT fluctuate. A white person cannot have at one point been indigenous to the Americas. A native of Paraguay cannot in the future be native to Sweden. A white person will not ever know what it is to be a person of color. These things are both wrong; they are not the same.