Hmm, let's see what the Amendment says.
Section 1. All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.
There are laws requiring businesses to serve protected classes. Those laws provide zero protection against the exact same discrimination for those outside those protected classes. That is exactly the same as claiming that gay people weren't being discriminated against because straight people couldn't marry someone of the same sex either.
You'd think that's what would happen, but in fact we're simply moving toward a society where the law means different things for different people. Honestly, that's how we started. All men are created equal - but not you, you're colored. We had a brief fling flirting with actually living up to our professed ideals; that's now long over.
Amen, brother. It's like we have to discriminate against someone, for some reason, or we'll burst.