Most states tend to not be a dick about it, but each state has tint laws that apply to all vehicles operating on the public roads of that state. It doesn't matter where the vehicle is registered, since you have to abide by the motor vehicle laws of the state in which you are driving. If you go to court and fight a tint citation, you'll almost certainly lose.
A few years ago I was pulled over in Iowa for (A) having window tint (they allow none) and (B) not having a front license plate. I explained the window tint was the darkest that Kentucky allows, and he seemed OK with that. He gave me a warning, and told me that if I was going to spend extended times in Iowa that I should remedy the situation. I told him that while a corn-based diet clearly produces extraordinarily beautiful women, my job generally requires that I spend as little time in Iowa as possible, and that I'm fine with that. He got a kick out of that.
He was more concerned with the lack of a front license plate. He even called in to his dispatch to confirm that Kentucky does not issue front plates. Weird.