I have an ex-husband, too, and I have to make a concerted effort not to be bitter. It’s not always easy, but although I’m sure he doesn’t care what I think of him, I care that I don’t want to hold on to negative feelings, because it affects me in a negative way.
You’re right, though, that you can’t make someone accept love or embrace it or hold onto it, anymore than you can force someone to hate. I think the best thing to do is not worry about others’ thoughts and focus on our own, not for anyone else’s sake, but for our own peace of mind. When we find our own peaceful, loving path, others are affected by our example and our energy in a positive way if they open to it, and we don’t have to do a thing. It’s the same with hatred. We can open ourselves to it, or we can reject it and hold onto our love and peace. Obviously, it’s easier said than done, especially if we are under attack, but it’s a good goal to work toward. Blessings.