Not necessarily mutually exclusive.
It is a State’s Rights issue,,but that doesn’t mean the law passed was stupid/or great. Trump can have an opinion on that law without stepping on the rights of the state.
See the difference?
He's running for POTUS. The question was:
“Mr. Trump, please be specific. Tell us your views on LGBT, how you plan to be inclusive as president. Speak about North Carolina bathroom law in particular,"His first answer was that NC shouldn't have passed such a law because things are fine the way they are and requiring new bathrooms would be expensive and discriminatory.
Hours later, he says it's a states' rights issue.
"NC shouldn't do that" is the opposite of "NC should do whatever it wants."
I'd agree with you if he had said, "I oppose NC's position on the law, but it is their legal right to take that position." But he didn't say that.