I would call that bullying or abuse. Kids can sometimes be very cruel and do things to their peers adults would never do. I experienced bullying in kindergarten and school for many years before age 10 and it definitely had lasting effects on how how I socialize (or don't), how I am often reluctant to ask for help or etc. The way I ended up handling it over the years is to be very selective in my relationships, I'm quite picky about who I allow close or even spend time with. The childhood bullying was also the reason why I started socializing with adults much more than with kids, and to date most of my good friends tend to be much older than myself. So definitely some persistent effects.