That old piece of paper circumscribes the governing law of the land. The Supreme Court absolutely is bound by it. In fact their authority comes from it and it is their solemn duty to interpret it and use it to throw out improper legislation.
You understand that words mean things, right?
When you say that Supreme Court is "absolutely bound" by something, that's a testible hypothesis, no less so than if I said a brick is absolutely bound by gravity. If a brick could just decide to hover in midair then that would falsify my claim that it was bound by gravity.
Likewise, if you claim that a piece of paper binds people, and those people can be observed to do whatever they want regardless of what is written on said paper, and the paper responds to this violation by doing absolutely nothing at all since it is, in fact, just a piece of paper, then by what possible universe could you say that piece of paper is binding them?
To all those who would cavalierly tear up the Constitution, beware the wrath of patriots.
That would be hilarious if it wasn't so pathetically sad.