CRR writes:
Do the physics and you will find this is only true on a flat Earth.
I believe you missed the point.
Some statements are strong in one context, and weak in another depending on the point attempting to be made at the time.
If Tyson always made all statements correct for all contexts, he would be extremely verbose and lose a lot of interest from his target audience.
What he said is obviously to be taken in context of whether or not horizontal motion affects vertical motion.
His statement, according to this point, is absolutely correct.
If you want to know his views on a flat Earth, or how curvature of the Earth affects gun shots, why don't you ask him about that context instead of trying to put together a weak 'gotcha' moment that really speaks more about you than it does about Tyson's views.
TL/DR: This isn't first grade. Put on your big boy pants and try to be honest.