Admitted states are, truly, little more than administrative districts. States' rights fanatics hate this fact. In other words, the United States of America is
a state. It's not a body or an association or a federation or a conglomerate. It's a state, a nation, a single
indissoluble entity that is made up of many parts (like almost every other nation on the planet).
So when people start talking about seceding this or seceding that, it's less like a fully functioning nation wanting its "freedom back", and more like your bratty kid wanting to "secede" his room from your house. And it deserves the same response.
Do people, outside of that fail circus that is the far-right, ever take this stuff seriously?
The Founding Fathers did, as did the original states, several of which explicitly
reserved the right of secession in their ratification of the Constitution.
The current state of affairs (which is what you describe above) is NOT the US that was formed in 1776. It is the "indissoluble", unitary nation that Lincoln turned it into by force of arms.