I don't know why (espacially key-) people in development (Torvalds, now Rossum etc.) seem to have a hard time phrasing their thoughts with a little more consideration.
Would it hurt to put it more like "this project is not of interest to me" - what is completely misguided in working on something and trying things? Or to restrain oneself from bashing the effort as being "laughable" and instead try to offer ideas for improvement or presenting the alternatives without discrediting the whole thing. And if he is bored, why not just skip the whole thing?