Did I say the right thing regarding "farting noises"?

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"Can I come over and play" Those were the words I heard on my phone about an hour ago, as I was grading papers. He played with his cars, I showed him I'd been driving his blue Mustang (it was atop one of my speakers), and we finished up the last slat on my balcony table, as well as one more slat on our dumpster table project. After he had returned to his cars, and me to one of my AR-3s (my latest speaker restoration project), I heard some wicked fart sounds coming from his play area, near my main stereo I could have said, Oh, you poor thing, but instead I said, You can't fool me. I was one of the great arm fart noise makers of my day. I suppose that making farting noises with your arm is a universal stage of child development for boys, at least in the United States. When he demonstrated his technique, I deadpanned, That didn't sound wet enough. When he put a bit more spit into it, I said, Now THAT sounds like someone has made a terrible mess in their underpants. Of course he giggled, but when he started to practice further, I said, Fart noises must be used with discretion. Do it too much, and it loses its humor potential. Do it around teachers, and you get in trouble. I recommend practicing on your own and only doing it when one of your friends thinks they make the best fart noises at your school. Then you show them. He giggled again, and he stopped making farting sounds with his arm. Do you think I said the right thing? My adult arm is much hairier than my 8-year-old arm was, and I can no longer make the glorious juicy fart noises I could make as a child (I just tried). But I understand that it's something boys must go through. Did you make farting sounds with your arm as a child? Do you see it as inevitable developmental stage? Do girls enjoy making disgusting sounds as much as boys do?