Laughter and tears are both responses to frustration and exhaustion. I myself prefer to laugh, since there is less cleaning do to do afterward.
Sometimes it is just easier to laugh than to let stress get the best of you. Over the past few months I have gone through situations in which I was stretched far beyond what I thought was possible, and in that time of stress, I have found that it is just a better response to laugh than to express the weight of the stress otherwise. It is not always easy to laugh during stressful periods, but when considering the alternative reactions, it is probably the easiest to explain. This quote is discussing human emotion and the odd and different ways we can all react to the same situations. When the author says he prefers to laugh rather than cry, since it is easier to clean up, I look at the phrase figuratively rather than as a literal statement. When I read this quote I imagine the mess that goes along with being upset, tears can be shed for sadness or for anger, and whenever they are shed they are usually accompanied by the actions of these emotions. I have done and said some terrible things when I was upset, and while they all do not need the most extensive cleanup, it is better to not have to deal with fixing a mess that was made due to a stress reaction emotion. I understand that laughter is not the easiest tactic to learn when it comes to dealing with stress, but once it is mastered, you will quickly find that it is not only the best way to face stress, but it can also be one of the best ways of relieving the pressure of stress.