This saying reminds us to take it easy and not be afraid to see the lighter side of things. It also reminds us that we are saved. We can laugh together at what we experienced because we can relate to each other. We are truly laughing "with" and not "at." Try not to take life too seriously. The Big Book reminds us that "We are not a glum lot." Thoe who laugh have lasting sobriety.
It's OK to laugh. It is great medicine to reduce stress, relapse cravings, and other bad feelings.