[MO] Is it illegal to build a fence just shy of your property line and paint the side facing your neighbor in a way they'd hate?

So I imagine this scenerio. You have a rude neighbor who you hate. What if you build a fence on your property, so its maybe half a foot or so away from the property line. Are you then allowed to do whatever you want to the side that faces your neighbor? Such as paint it rainbow colors if they hate gay people perhaps. Where can you draw the line?I'm sure you're not allowed to draw obscene things on there but what if you drew a bunch of scantily clad women with large breasts for your super uptight Christian neighbors?Not asking about the morality here, I'm asking about the legality via /r/legaladvice https://ift.tt/2COW3tW