That's fair enough, but when and where, if at all, should the mum socialize her dc and have "mum-chat time" herself?
There is the school of thought that if you choose to rigidly stick to an "all hail the lack of coercion" style of parenting, and flatly refuse to acknowledge that it is making you and your child somewhat not fun for other people to be around in social settings, then it is you, not the other "nasty" mums, who has denied your child willing playmates to socialise with and you, not the other "nasty" mums, who has denied yourself the niceness of adult company happy for a chat.
Back in the real world, you can't choose a "complete non interference" style of bringing up your child, ignore that it isn't aiding their ability to settle well into social situations and then optimistically expect everybody else...
-to take their lumps without seriously going off the dealer of the lumps
-to show a tolerance for and understanding of your sentiments/values, particularly when you demonstrably do not intend to reciprocate
-to be friendly and welcoming in the face of your indifference to their hurt and tearful toddlers
-to support you during the times you are overwhelmed by the behaviours you have allowed to flourish via inaction, all while you deny them mere acknowledgement when their child is on the sharp end of said behaviours
-to not groan inwardly and write this session off as a lost cause as soon as they see you and toddler approaching the door, while surreptitiously googling alternative groups cos they have enough parenting issues of their own to resolve each day without adding your parenting issues to the their load
Everybody gets to pick their style, but it has to be done bearing in mind the reality that you are also picking the consequences of that choice for yourself and your kid. Especially if you ignore that it has turned out not to be a good fit for you and yours, and people start withdrawing and rejecting the pair of you.
It is nonsensical to blame irritated, frustrated, cross and retreating people for being unwillingly cast as the consequences of another parent refusing to recognise that her preferred style and actual child go together as well as salt and coffee.