Treat your “enemy” well and see if they respond in a reasonable way. If not, others will see that you have tried and some (perhaps most) will respect you for trying. The other people are the people whose respect is worth having.

Once you have tried everything to solve, turn them over to the universe and walk away (mentally, if you can’t actually leave). They have their own issues to work out. Ignore them and focus on your own strength and positive attributes. Always remember that you can’t please all the people all the time. It’s impossible. Doing the best you can at the time is all you should expect of yourself or others.