Parent question regarding bullies

I have an autistic 3rd grader in Gen Ed. I’m at the school often. Currently I am there 2-4x a month to accompany my kid through recess/lunch because recess is chaos. Anyway, while I’m there I often get tattletale kids telling me things my kid has done. What do I say? Do I parent them? Let the teacher/monitor handle it? Ignore them? These are usually kids that my kid says bully him.