6 year old has a secret

My son had a secret but wouldn’t ever tell us. Finally I got him to tell me the secret. He said his friend (7F) “watches boys peeing on the TV…..” uhhhhh what?
Her parents are divorced and there is definitely a “vibe” I can’t put my finger on when we go there…we are moving towns next year should I just leave this shit be …. I don’t really want to message the mom either this. As a dad I’m freaked out a bit by this but still not sure what it even might mean?

Thoughts on how to approach?