love your neighbor as yourself was written to Christians. Christians have a purpose and are looking forward to being with God in heaven.
Besides, let's say you wanted to punch someone, this verse reminds you to stop and think, if I were in their shoes, would I want to be punched? The answer is no. And before you say that you actually do want to be punched, go ask the nearest person to punch you. Then you will know whether or not ur statement about wanting to get punched is true