Bullying in schools

My 5 year old says he is getting bullied at school , other kids jumping on him and pushing him about so i went to the teacher and she said uhe is not being bullie its just playground frolics.

I am going to go watch them at playtime some day but dont know when.

I was bullied at school in the later years from roughly about 14-16 years because i was over 6 foor and built like a pin, i would love to see a couple of those guys now as i,m 6’6" and 18 stone, somehow i dont think it would happen if they saw me now.