If this is happen please file a complaint against that gamer. And you are not being banned from Xbox Live by this person you are being disconnected from the internet. You can contact your Internet Service Provider to fix this issue.
Justin C. Microsoft Office Specialist
Did this solve your problem?
Sorry this didn't help.
Great! Thanks for marking this as the answer.
How satisfied are you with this reply?
Thanks for your feedback, it helps us improve the site.