Want to know the real f*cked up thing? If he was searched by a woman it's considered fine by the authorities. If he was searched by a man, well then that has broken the rules and you can report them.
I don't think you should (unless you feel they were being inappropriate) just pointing out how ****ed up it is that the rules surrounding searching children automatically assumes that men are more likely to want to touch up kids.
As for him being searched, as long as you were present, gave consent and it was by a woman then it's perfectly legal. If you wanted to refuse consent they probably would have let you in eventually but would have been entitled to refuse him entry and then refuse you entry on the grounds that a minor couldn't be left unaccompanied.
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