If you fall into the trap of behaving like an outsider because that's how you're feeling, you'll only continue the cycle. Focus more on your own life and other aspects of it, enjoying your marriage and friends and focus less on the kids.
Not everything I do is because of "the divorce" or because I don't like you. Please try to remember what you felt like when you were my age. No matter how good a parent you are, I'm probably going to try to pull away or even rebel in small or big ways.
Many parents thought the song should be an anthem in every elementary school in the country. But others refused to let their child sing on the song, or even sing on the recording, if we were going to include this song.
To all of you co-parents out there, especially the new ones -- these struggles are real. Don't feel bad because your co-parenting relationship isn't one in which you are best friends with your ex or their spouse.