Gravity is described by theory, just like everything else in science. When people say they drop somehting and it falls, that is a demonstration of the effect of gravity, but it is not an explanation of why the object fell. That explanation is the Theory of Gravity.
This parallels evolution. Species change and diverge over time. The fossil record and the science of genetics demonstrates this. That is a fact. Evolution explains why these changes occur, just like how the theory of gravity explains why things fall. If you don't want theories in science taught, you then are demanding no science be taught. Hence, you are anti-science.