If you think someone is posting off topic and disrupting a thread, report it for staff to look at. By posting "off topic", you too have now posted off topic and helped further derail a thread. If someone is pestering at you or starting issues, report their post and let staff handle it. If you fight with someone and be a part of ruining a thread, you too will chance being removed from the thread and having any posts moved to the cage forum.
Report posts and let staff determine if there are rule violations or someone being disruptive.
