Do you think it is rude when someone points out an obvious physical flaw?

I am the type of guy that will tell you if you have something in your teeth, but I’m not going to point out that you are short, balding, or your eyes are crooked. I had s girl point out one of mine the other day and I was like…. “NO SHIT, thanks for letting me know about that, I had no idea because I have never looked in a mirror”