Anytime a child has more than one parent participating in their upbringing, there are going to be differences of opinion. Sometimes the difference is minor, sometimes the difference is huge and the consequences of one way or another seem like they'll ruin the life of your precious child. I guess that's the trick to co-parenting well; keeping calm while you decide if fighting over your child will harm them more than the thing you're fighting for. Way easier said than done.
A child is innocently caught between their parent's disagreement.
You know that thing you don't let us do? We did that today! Traitor.