Where is "gay" listed as a protected class in the Constitution?It's absurd to suggest the 14th deprived the states the power to regulate marriage.
Strawman alert, I didn't argue such a position.
Of course the States can regulate Civil Marriage. However such regulation are subject to Constitutional guarantees. For example, the State of Alabama passed a state constitutional amendment to ban interracial marriage. If states had unlimited powers to infringe on individual rights then from your position the SCOTUS ruled incorrectly in Loving v. Virginia and should have upheld state bans on interracial marriage. History shows that didn't happen.
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Actually, since "gay marriage" is really a misnomer--you dont have to be gay to marry someone of the same sex--then gay marriage would apply equally. Which means there is no discrimination whatsoever.