The times haven't changed. The federal government would view it as insurrection, and it would understand that no foreign leader would take us seriously if the rebellion weren't quashed. You would be facing chemical, biological and perhaps nuclear weaponry, and the federal meme would be that you brought it upon yourself. The Mainstream Media would sound this drumbeat like they did after Waco.
And don't think the military won't fire on its own people. Look up "Bonus March + 1932" for a preview. Once the federal government declares you an insurgent, you're as good as dead.
Why did Eisenhower use federal troops in Little Rock? Because his Secretary of State, John Foster Dulles, told him that Krushchev would not take him seriously if he didn't put the rebellion down quickly.