I would think it was nice that someone was taking an interest in what I made.
I think the one exception is what quiltingcandy referred to, if the person were asking so that they can look down on my answer ("Polyester? I would never use that.") But that's clearly not the case here. I always start out assuming the person has good intentions, and most people do, so I wouldn't be offended unless it was clear that the person was just trying to be mean.