> ...starts insinuating that the reason your kid doesn't have a phone is so they can't call for help... from you.
I mean, parents, are -far and away- the most likely folks to abuse a kid, followed by friends of the family and close relatives. Stranger Danger was always fake, and teaching kids to be afraid of every adult who's not a family member is -and continues to be- a fantastic way to perpetuate child abuse.
But. Internet trolls are gonna troll and are best disregarded. If those folks seriously live in an area where an abused kid can never physically go to a teacher or other responsible adult for assistance, I'd recommend that they get the fuck out of whatever hellhole they're living in.