The coach is probably confusing the rule about the batted ball HITTING THE BATTER in the box. That's a foul, no matter where in the box it hits him. 6.05(g) if you're using OBR, but I believe all rule sets are the same.
If it doesn't hit the batter, the rules for fair/foul are the same in the batter's box as anywhere else on the field.
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Patrick
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