Since I'm tired of that discussion which is going nowhere I'll just put this here.
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Now, let me examine the series:
"Coffee is dangerous."
"No it isn't, X can drink loads of it."
"X is tolerant, the effects are still there. Try it with a 4 year old."
"4 year olds are not tolerant to many other things."
That 4 year olds are not tolerant does not mean that every adult is totally tolerant and that that is a natural tolerance. Coffee is not inert.
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Most adults are tolerant. The fact that only a few are intolerant doesn't make it dangerous for everyone. It's just like saying milk is dangerous because a few people are lactose intolerant.