Well I’m very very sorry to bluemirror if I’ve been rude but has anyone really ever sent a text “I’m about to send you a picture of everyone having fun at x’s party but 9 of their peers are on it can I send it you?” No??? I thought not!
That’s not what people are saying though, it’s the double standard of you expecting to be asked if sharing your child’s photo isn’t ok when you’ve actually shared 9 children’s photos with other parents without checking that’s ok.
You’re example text is asking a parent if they mind accepting a photo with a bunch of other kids in. When it should be “Hello BenMum, I’ve taken a initial of Ben having fun with his friends at Amy’s party, is it ok to send his photo to eight parents?”
For all you know, some of the other parents may feel strongly about their child’s photos being on Facebook. I’d be a bit narked at you sending my child’s photo to other parents without my knowledge who then went on to post my child on social media without my knowledge.
It’s not unreasonable for the mum to think it’s ok, yes she should have checked, but you should have mentioned no social media, esp as it’s not just your child they don’t have permission but the other parents who might not want their child’s photo sharing by you to other parents, or to Facebook.