Not a "professional" here either but looking at your picture. I don't see anything that's NOT a yorkie about her/him. Maybe the lady you encountered is bit... slow. She obviously doesn't have THAT much knowledge about the breed if she thinks there's only ONE LOOK a 100% PURE yorkie can have. There are plenty on YTers who have "non standard" looking yorkies that are pure breed.
Got annoyed by the rude lady and forgot to welcome you to YT.
Your baby is just adorable!!!!