When cornered, construct a strawman & fling your own poo in its direction as a gesture of denial.
Examples of States' Rights being anything other than a means of oppression are quite rare.
Well, unless you think that Jim Crow isn't oppressive, or that old white men should determine the extent of women's rights.
Colorado's Amendment 64 is the only example I can think of offhand, something that "conservatives" (authoritarians) fought tooth & nail, something that they will bemoan for all eternity.
How about taxes? Seems like a pretty big states right thing that different states take a much different approach to. Gun laws being another off the top of my head.
Hell if it was like you are implying there would be almost no purpose of state legislatures.