There are a couple missed points in that article. First, those kinds of somewhat aggressive questions are far more likely to be asked by the young MBAs VC firms hire to poke holes in business plans and do other grunt work. This is how they have fun. VC partners seldom need to publicly stroke their egos. Secondly, of course someone else had that idea first. The future is here. Your "idea" amounts to creating a local maximum in future distribution because you can execute on that idea particularly well.

So don't get insulted by the person asking, or by the question itself.