Tagging a runner in the head illegal?

[Norm Cash]

We had a call reversed against us the other night when a coach told the ump tagging in the head is illegal. Ump had originally called the runner out on a very close play. We called for a BOD member to settle the dispute but stupidly let the call go after about a 6 - minute delay without the BOD member showing up to settle the dispute. I now feel we should have made the coach show us the rule as I don't think it exists. LL rules in our league. Am I right that we blew it? The call didn't cost us the game but it did cost us on run and we lost by 3. I just hate it when coaches want to decide a game between 7-8 year olds instead of letting the kids decide it themselves. Thanks.