Why do people say kid in baseball?

Why do people say kid in baseball? “Not your pitch, kid. Not your pitch.” This is something a fan will shout when a player has taken a called strike. It sounds encouraging, like “you’ll get them next time” but what it really means is “You should’ve swung at that one.

“Not your pitch, kid. Not your pitch.” This is something a fan will shout when a player has taken a called strike. It sounds encouraging, like “you’ll get them next time” but what it really means is “You should’ve swung at that one.