Gays cannot be discriminated against. They are a "protected class of people" who cannot be discriminated against.
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But, and this may be one of the issues, is "offensive artwork" "people"? Do "artists" have the right to claim that "offensive artwork" they are being asked to "create" is "offensive artwork" and, therefore, is not a "protected class of people"?
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That logical reasoning is why a Jewish baker doesn't have to decorate a Nazi cake with Nazi symbols, why a Black baker doesn't have to decorate a cake showing a man being lynched by the KKK, or a painter doesn't have to paint a painting showing Hillary with horns.
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It is wrong to discriminate against people.....but "offensive artwork" is not "people" and is not a "protected class" of anything.