Fester, Fester, Fester. I *know* you have been told time and time again what a Scientific Theory is.
It is disingenuous for you to pretend you don't know what it is and why it is that the Theory of Evolution is a much more mature and filled-out theory than the Theory of Gravity.
Seeing something fall down is a DATUM in the TToG.
Give him a break. It might be one of the OTHER Festers at his frat house...