BS.
Parents think their badly socialized little brat is being "bullied" when the other kids do not want to play with them.
What the parents do not want to admit is their child IS the bully but lacks enough social skills to form a gang.
The other kids react in the only way they know how which is to avoid them.
Talk to parents of school age kids. It starts in elementary school sometimes. Then it gets intense when the kids reach puberty. It’s girls too. Actually, it can get especially bad for girls. There’s not a school in the country where it doesn’t go on.