Again, nowhere in the Constitution does it mention gay marriage rights or marriage in general. The duty of the Supreme Court justices is to rule on Constitutional law; therefore they had no business in ruling on the issue in the first place.
The role of the SCOTUS extends to "all cases, in law and equity, arising under this Constitution", the plaintiffs in Obergefell
et al argued that laws disallowing them from obtaining a marriage license (laws banning same sex marriage) in Ohio, Michigan, Kentucky, and Tennessee violated the Equal Protection Clause and Due Process Clause of the Fourteenth Amendment.
So, as per the U.S. Constitution, Article III, Section 2, this was a case "in law and equity, arising under this Constitution".
So you're wrong.
You're welcome to continue being wrong, but you're wrong.
What's amusing is that while Conservatives cry foul at the notion that a portion of the Federal government (the SCOTUS) has no Constitutional standing to "define" marriage, it was those very same Conservatives who in 1996 willingly handed the power to define marriage to the Federal government when they lobbied and passed the Federal Defense of Marriage Act.