I have heard that a bullet shot horizontally to the earth will hit the dirt at the same time as if dropped to the ground from point of fire.
True or false
That is true.
True. Gravity affects them both equally.
The problem is that a bullet fired at an angle rather than straight up is “in the dirt” (or in somebody’s skull) before air resistance has had a chance to reduce the bullet to a non-lethal velocity. The more horizontal the firing angle, the less time the bullet spends in the air before it is at head level.