Why is it that christians think gay people need their approval for their "lifestyle" choice? When did they choose to be straight?

I always see christians say that they don't "approve" of the gay lifestyle. Well who are Christians to arrogantly think that the world is asking their approval to get married to the same gender or have a sex change.

Why is it that christians think gay people need their approval for their "lifestyle" choice? When did they choose to be straight?
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