Ouch. That must have been a very difficult comment to hear. I can really empathize with how you must have felt to read someone else calling you a bad parent. That is after all- every parents worst fear.
One of the downsides to writing an opinion piece on the web - is that there will always be people that disagree with you. Some vehemently. And by reading your words - they will feel it's an invitation for them to write back. Which in most cases it is...
I think your commenter was someone that obviously had very strong feelings on this subject to begin with. And in her eyes, she sees it as a child being hurt. As a mom I know you can understand how emotional you can get when you believe you see a child being hurt. While I don't agree with what she wrote you- I do believe she was probably caught up in a very real "for her" fear that your child had been traumatized -and she reacted as such. And as moms we all have tender hearts for babies- and I bet you can see how that feeling might cause her to get more heated than perhaps she would normally.
But.Doesn't make it true. Or easy to read.
Mostly I send you big hugs, I think you are doing the right thing by sharing your heart as honestly as you can. There will always be people that disagree with individual parenting choices. But moms sharing what works for them and doesn't, can really be a huge help to others.
My heart really aches for you, and also for her. You both sound like good women that ended up on two sides of a fence. Try to let go of the hurt as best you can. Sending you cyber hugs.