"Nobody's complaining that he's coming out."
"Some of them are. According to the article, they think he's saying being gay is a choice."
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Spacey apparently is saying just that: It's a choice that he freely chose....and is proud of.
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But that contradicts the "we are born this way" and "it's not our choice because we are born this way" mantra that gays have proclaimed for decades. 
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It's one thing for the gay community to pretend that homosexuality is akin to "race" that no one can do anything about; it's another for Spacey to proclaim that, "Not at all, it's a choice. It's a complete choice."