It strikes me that knowing and understanding that there are differences in the way we each behave in different situations is important but what is more important is really knowing yourself, really knowing your own preferences for communication style, self awareness of what floats your boat and what gets you fired up.  Once you become clear about your own style - humour vs serious - you can then ensure that there is a balance, being open to humour if it is not necessarily your thing, being willing to go deeper if you have a tendency for keeping things light, but also being able to reflect back to others this need for balance.  If someone is dominating the conversation with their preferred style it is important to be able to reflect this back to them in a manner that helps achieve balanced conversation - this to me, is where the magic lies.