There is a good reason Jesus commanded us to love our enemies. That reason specifically relates to how much it isn’t easy. If it were easy to love enemies, Jesus wouldn’t have needed to make it a command. But, it isn’t, so he did. And, most of us have a better idea.
Jesus’s command wasn’t enough for most of us, especially those who think they believe Jesus and thus think they define truth and so justify their grudges. But, when someone else tells us to return kindness for insult, we listen and often discover that enemies can become excellent friends.