Evidently we've been lied to our whole lives.
According to New York Daily News "bless you" is a phrase we all do BUT there's 5 reasons why we should STOP saying it.
1. The plague is no longer a thing. And thank God, sure, that we no longer live in a world where the pope (Gregory I in 600 AD, to be exact) is imposing on us the responsibility to bless one another to protect us from dying from the bubonic plague.