I have done this in the past. Now I do my best to avoid pointing things out. In the past it would stop me from doing something or completing something. I make more things than anyone in my family (my sister might crochet more than I do but not by much) and give almost all of it away. Everyone is delighted that I thought of them. So I now am operating on the "Just Do It" theory, if you want to do just go ahead and do it. If you enjoy doing it who cares what others think? Those who nitpick everything apart say things because they not able to do what you did anyway!
So now I say Too Bad! So Sad. And I go on and do my own thing.