When my son was around this same age, my sister would not stop verbally agitating and harassing me about his hair. His hair began to curl at the ends, especially in the back. He was precious and it was beautiful. Eventually I cut the sides shorter and left the curls in the back. Then she harassed me by saying that he had a mullet. It was never about my son's hair, it was about hurting me.
It is one thing to have an opinion, but another to feel the need to insist intrusively that others abide by such opinions.
I admire that you are sensitive and thought about your previously held thoughts. I understand this too. Well done on this article.
Your grandson is adorable.
BTW: I love your new profile photo. : )