Funny you should mention that one quote of Jesus'. Remember when Paul got slapped for "disparaging" the High Priest or was it Ruler of the Synagogue? That was the standard "punishment" for improper etiquette... AKA being rude. When Jesus was saying that if someone feels like you are being rude and is offended that you should offer up both cheeks to be punished to take back the insult. (The gospel message being offensive enough in it's own right) The big IOW is that we shouldn't be rude in any respect. It's contrary to extending grace in our speech. Respecting Authority figures is commanded by Jesus because He was the one who placed them there. God sets up leaders or deposes them. It's not our job to do God's job or to advise Jesus of what we think of His leaders.