Showing respect to someone means you act in a way that shows you care about their feelings and well-being. Showing respect for others includes things like not calling people names, treating people with courtesy, caring enough about them that you don't do things you know can hurt them.
Showing respect says more about you than the one being respected. Consequently, disrespecting someone conveys more about you than the person being disrespected. Why? Because, the way we behave toward others is an expression of our values and character, not theirs.
Since this is true, we should treat others with respect, not because they have a right, but because we have a moral duty to do unto others the way we want them to do unto us.
Again, it’s not necessarily because they deserve it, but because doing less only diminishes our own character.
Take Away: Showing respect says more about you than the one being respected.