As the rule stands, it reads as follows:
11. Purposefully making someone angry or trying to provoke an angry or otherwise hostile response from them will be treated as any other rule break and will be dealt with accordingly and according to severity.
I believe there should be an amendment to this rule instead of a removal. It can usually be hard to tell when someone is intentionally provoking an angry response out of someone, though even with that I don't deny that on the occasions it does happen there should still be something in place.
The amendment I propose would make it so that if a user finds something another user says as either offensive, or insensitive, etc. (Feel Free to Add Legitimate Reasons) then the user who found it offensive would politely ask the other user to stop, or change subjects, etc. It would be a requirement to be polite/civil when making the request, as in the past it has been shown that simply shouting at the offending user or cursing them out generally leads to further arguing.
Failure of the offending user to oblige this request will simply lead to the same treatment as any other rule breaking: warning, kick, then ban in that order if required.