This is great practice for the real world. The kid strikes out. The kid who strikes out knows he screwed up, so reminding him or her of this fact only nurtures resentment. A positive statement always gets results. Honey attracts more flies than vinegar.
Baseball is nothing more than a math lesson.
A kid who can't add or subtract generally can figure out his or her batting average. See if you can. More kids would pass math if it was taught on ball fields. Playing baseball teaches you' Murphy's Third Law that if something can happen it will. The saying that it only matters how you play is bunk.