It's not nonsense in a legal sense, as I pointed out earlier.
SCOTUS struck down all prohibitions against interracial marriage in 1967. Some states did not repeal or rewrite their laws to reflect that reality until much later. Were all the marriages approved by those states after the court decision, but before the repeal/rewrite of the applicable part of their marriage laws, null and void?
Of course not. And this is but one example of something that happens across the country every single day.
The definition of marriage was untouched.
Society has never recognized marriage between members of the same gender. Marriage has always meant a union of opposite genders.
The nature of humans requires opposite genders for humanity to survive. Homosexual unions can not - by their very nature - produce offspring. The USSC has arrogated to itself the authority to alter the definition of marriage.
Comparing homosexual unions to bans on interracial marriage *is* nonsense.