Story is real or not aside, why would you not laugh it off? At that stage nothing can be changed, money was lost and bug was fixed. You can only look forward and plan for the future and the guy is going to be paranoid in the future deployments to make sure not to fuck up again.
In general yes, and people with enough Zen can do this. But if also the CEO is looking forward to hear from the board and the investors to explain the incident, he might not be in the mood to laugh.
