What part of it violates the constitution do you not understand? It's really very very simple. Just because something may seem trivial to you doesn't mean it should be dismissed. Look up the definition of slippery slope and hopefully you will begin to understand that if you begin letting little things like this slide they will lead to bigger and bigger encroachments into the separation of church and state.

Let me give you an example. You see your child stealing a pack of gum from a grocery store, you know it's illegal but hey, it's only a pack of gum right? Not a big deal. Wrong. Stealing is illegal and if you dont correct this behavior immediately you are implying to your child that stealing is "ok" as long as it's just a little thing, I mean you can easily ignore something so non offensive and non threatening because it doesn't cost you an ounce of effort. Problem is, you have just taught your child a horrible lesson and they will most likely continue to push the boundaries of what is so non offensive and non threatening until it requires severe repercussions in order to correct the behavior. By addressing the problem before it gets out of hand you prevent it from snowballing into something much much more serious.