Of course you are welcome to your opinion, but the United States Supreme Court disagreed just like they disagreed with the Commonwealth of Virginia when they said in the Loving case in 1967 that there no violation of equal protection because coloreds and whites were treated differently
Being gay does not change who you can marry under the law. Being black did change who you could marry under the law. They got that one right.
Regardless of getting Loving right, the SCOTUS isn't deserving of any respect. They have also found in the Constitution:
1) Government can confiscate property from one citizen and give it to another for the benefit of the government and not public use (New London).
2) They can base their rulings on the laws of other countries.
3) Government can regulate political speech heading into elections (so called campaign finance reform).
4) Discrimination in favor of blacks is acceptable for 25 years (O'Conner)
5) Government can regulate intrastate trade
6) Obamacare and all it's regulations and mandates is just a tax.
7) The 9th and 10th amendments were completely eliminated under FDR.
Then there's the oldie and goodie that blacks are property that are to be returned to their owners.
Then there are things they made up completely, including separation of church and State, the right to an abortion and Miranda. And there are gyrations like "privacy." Privacy is iron clad protected by the 9th and 10th amendments. But they eliminated that, so they had to make up a new right to privacy, which then gives them a bunch of more powers.
And while technically I concede you're right they overturned the Federal portion, clearly now all of DOMA has to be overturned because if you accept their argument on Federal employees based on the 14th Amendment for the Federal government, in what possible way are the States not violating the 14th Amendment since the court said not recognizing gay marriage is a violation of the 14th, and the Constitution also says that the States are subject to the Consitution? They aren't of course, but now the Court has to either overturn their bad DOMA ruling or apply it to all of DOMA. Of course they will do the latter, just a matter of time.