I believe this is a symptom of extreme thinking when people have made up their minds and have no intention of discussion with people who hold a different perspective. I also think there are few extremists who are capable of laughing at themselves—they take their views too seriously and won’t step back to look at themselves.
Humor can be used to diffuse difficult situations, but it is also part of human nature. Most of us enjoy a good chuckle. I think it’s important to take positions on key topics, but let’s not take ourselves too seriously in the process.