[maym86]

The net neutrality debate is about the repeal of fedral rules rather than adding an additional law. Thus a state's right to set their own rules applies. There is no fedral law to make ISPs behave in a certain way, just the lack of one, so the states should be able to set their own rules in cases like this as long as they are not unconstitutional.

States' rights do not apply in the opposite case when a fedral rule is made and the states don't want to enforce it or have a law that contradicts it. Their laws can't undermine the fedral law.

Hope that's helpful for your understanding of why this is different to the normal "states' rights" argument which is invoked when a state wants to avoid fedral rules.