#socialdevelopment

My 4yo is picking up negative behavior from friends. How can I shift this?

It seems that my 4yo son and other friends of the summer camp are getting a kick out of making a little boy upset and keep bothering him because they noticed he easily cries.
I already told my son that it is not okay to bother our friends if they do not want to be bothered.
What do you recommend?

How do I know if I am being too harsh or too lenient?

Yesterday, I took the three kids to the movies and to a park.  Before we left, my daughter grabbed her socks and I told her, she didn’t need socks because I was going to have them wear water shoes in case the sprinklers were on at the park and she wanted to get wet. She said she wanted to wear her regular shoes because she didn’t want to get wet.  I asked if she was sure and she told me yes. Once at the park, she eventually began leaping through the sprinklers, telling me she wasn’t getting her shoes wet, only her clothes, which was not the case.  Her shoes were getting wet.