K.L.
This is a subject that is very close to my heart. I so want parents to be more enlightened about effective parenting. Love for our children comes rather naturally to most, but parenting skills have to be learned. So many never think of it this way. We all have so much to learn. I promise you that, no matter how much you think you know, raising a child will prove to you just how much you do not know. I don't know of any parent worth their salt that, after raising their children, did not look back with regrets over the things they did not understand and wish they could have done things differently. That doesn't mean they were not excellent parents. But I can tell you that I learned more from raising my son than I was able to teach him.
Children need discipline as well as love and patience and kindness, but one of the best things to give your child is for you to live your life in a humble posture of learning. Try to think more about what you might be able to learn. Unless someone asks, you don't need to tell them what you do or do not do with your child. When you hear the other moms telling a story of indulging their children, you have the choice of saying nothing or saying something neutral like, "That isn't something we have tried" or "We are trying to balance discipline and love, but that is always a juggling act, isn't it?"
It does take a village to raise a child and how we raise our children will have an effect on other children and other families. Part of the reason the impulse to correct the other parents is so strong is because your motherly instincts prompt you to improve the community your child will grow up in. This is natural. But, if you want to improve your village, criticism is not a very effective tool to use.
By taking on a humble posture of learning as a parent and staying focussed on your own learning process, you are far more likely to effect your friends with your example. For instance, you might get books on parenting and language skills and really start improving yourself. In the excitement of learning, we naturally share our discoveries in our casual conversations. So, by being a 'learner' instead of a 'knower', you might actually attract others to become more interested in learning.
The book I have recommended to parents most often is The Family Virtues Guide, by Linda Popov. I promise you that if you stay more focussed on your own learning, you will be much happier, you will be a better parent than you thought you could be, and it will be easier to inspire others to move in that same direction.