There is a way you can set a helpful example, and not only for others but for yourself, too. This involves you adopting a different attitude to one others insist is appropriate. Where they're inclined to focus on what's negative or seemingly serious in a situation, you could create a helpful bit of chaos by making clear how and why you see it differently. This involves drawing attention to what's amusing or less-than-serious within it. If you can't shake it off, then laugh it off.