Should this person be banned for sending me my I.P address over message?

You should report the gamer using the Xbox reporting feature, and the enforcement team will investigate and give out the relevant action. Instructions how to report can be found here

https://enforcement.xbox.com/en-GB/home/howTo#sub-topic2-0

Nah reported over 16 hours ago still not banned and this is a serious offense it's literally illegal what he's doing.

You should report the gamer using the Xbox reporting feature, and the enforcement team will investigate and give out the relevant action. Instructions how to report can be found here

https://enforcement.xbox.com/en-GB/home/howTo#sub-topic2-0

It'll take a bit for Xbox to deal with them, so patience is key in this situation. Usually reports will take a couple days for them to handle (Depending on how many reports they get per day also).

They were using software to locate and isolate a persons I.P. Address then they have them lag out of the game by sending a very large amount of information to your modem/router over loading it which causes a multitude of errors pending on the size of the
attack. Its illegal. They should be banned for it.

They sent my full irl name upon sending me my i.p address.