If you mean to ask what is the limit allowed, I think it depends on the situation.
Many things are said in private chat, for example, that result in a 60 minute muting from the automated monitor.
If you are posting in the public forums and see something abusive, it is up to you to decide whether or not to report the player or to contact Support.
What is the limit to what you can get called (as an insult) on chess.com?