Tony_PolarGaming, thank you for your help! I am not looking to get the guy banned but that is valuable information for in the future! I will try having my son launch his world while not connected to the internet. We have xbox live gold (something like this?). Do I do this through xbox live settings? Thank you!

Hey! You will have to contact Xbox support. To play Xbox One minecraft, you need a Xbox live gold membership. Also, try making your son launch his world when not connected to the internet. If it works, xbox can ban him for upto 5 months off xbox live.
Hope that helps

PS: While I'm only 13, I know a lot about this stuff. It happened to my mum...

XBOX SUPPORT: xbox.com/support

somebody05, thank you very much for your help. I will do my best to research how to play single player and also how to ban players with xbox one version.

I am a PC Minecraft Player, and I do not know much about XBOX, but your son is probably playing on a multiplayer world. You can either move to Singleplayer, which pops up when you load the game, or if your son is the Owner/Maker of the world that Prohunter is playing on, he can probably use the command /ban ProHunter36
I dont play XBOX so I dont know the actual command button, but you can search it up.
Lastly, ProHunter36 is a Online player, for your info.