According to Osho, anger at certain jokes arises because a joke slips past defenses and strikes the ego, touching hidden wounds and repressed pain. Humor is a sharp, subtle arrow; when it fits you, seriousness and anger surface. Rather than resist, simply watch whatever comes (tears, anger, or laughter), allowing the pus to drain. This witnessing transforms hurt into healing, even opening the door to enlightenment.
You get angry because the joke pokes a hidden sore spot in your ego—so notice it calmly and let it help you heal.