I double-dog dare you to make that statement in any college level physics class. Newtonian physics are definitely NOT disproven, when you get into Relativistic physics (which are based upon Newtonian physics) you will soon realize that components at 'real world' speeds, masses and in non-relativistic timelines have for all intensive purposes zero impact upon the Newtonian model. That's why we refer to the LAWS of gravity, the LAWS of conservation of energy, and the LAWS of thermodynamics. Once disproven, the Laws cease to be Laws; they are trashed.
In Relativistic physics, Einstein showed that previously unthought of components in Newtonian physicls become significant, to the point of over-coming Newtonian components. However, the Newtonian components are always there, their contribution to the overall calculation just becomes less and less significant. If you write out Einstein's various Relativistic formulae, you will see that as mass get's more "earthly" or the speed is significatly below that of the speed of light, components will rapidly approach zero. So, if you simply discount these components as of zero value, you have Newton's formulae left over.
Did you even read my post?
"the point is his rules aren't universally applicable"
I'm not going to quibble with you about what "disproven" can or cannot mean. Newton's theory is not universally applicable, though still very useful in normal situations. The intent of my post was clear, and if you want to ignore it, I'm not going to bandy words with you.