:::  My answer to that is twofold. Firstly, if you read WP:AVOIDEDITWAR, you should not get involved in edit-warring even if the other party is at fault and you are right. Secondly, there is no need to get an agreement with the other user. You can just start an RfC (with a neutral wording), revert the edit one more time, and point to the RfC. That will end the edit war immediately.