???
You are conflating all the different legal systems of the US. US criminal law is the one of beyond reasonable doubt. US civil law on the other hand is an entire other bag of worms and 'potential' contractual obligations. On top of that private property has a pretty massive leeway in reasons you can ban people from said properties. There is no contradiction here. "Fuck you, your tie sucks" is a completely valid reason to remove you from their private property. Said person being a dick to others is what is typically considered an exceptionally valid reason to remove them from the property.
If we want to follow a broad social convention, then it is be nice to others, how about that for a start?