You realize your response is unprovable, do you not? The earth doesn't meet the ball unless in the size of the moon, or another stellar object of comparable size and mass.
Conservation of momentum. You cannot change the velocity of the centre of mass of a closed system. If you pick a reference frame where the centre of mass is at rest, it must remain at rest unless an outside force acts upon it.
If you mean the Earth/ball example is unmeasurable, you are no doubt correct, but if you sit down where you are standing you will have "raised" the Earth relative to where it would have been otherwise and all other things being equal.