Respect is earnt goes the old adage, and whilst there's an element of truth in this, it also suggests that there's a time for disrespect, and I'm not so sure about that.
One of my proudest achievements as a Dad is to have raised two sons who understand the power and significance of respecting others, and I love that throughout their entire school careers we had endless comments from teachers about how respectful they both were. I've drilled my sons on respect and they know that respect is given, whether it is earnt or demanded is irrelevant.