"Lazy, uncreative and pathetic."
I was pretty shocked by his reaction. I would think that other people copying a new paradigm his company created would be a complement. At least, that's how I would take it.
What would frustrate me if I was at Flipboard is the aesthetic similarity. It actually looks like a Flipboard branded product, due to choices in color, layout, format, and typography. That's not building on the innovation of Flipboard, it's building on the identity of Flipboard. The only real benefits of that:
* Skipping the process of developing a unique identity (lazy)
* Not having to have a vision to develop a unique identity (uncreative)
* Gain unearned associations with Flipboard (pathetic)
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The creativity here is getting the job done in Html5, it answers an implementation question, not an HCI question.