Is there a good word or idiom for self-laughter?

I was talking with a Chinese friend who was trying to translate a Nietzsche quote: "We should call every truth false which was not accompanied by at least one laugh."

For "laugh", he kept wanting to use words that have a derogatory sense: 嘲笑, 质疑, 嗤之以鼻. None of these quite capture Nietzsche's idea of a bemused and self-accepting laughter that can reflect on previous immaturity.

What do you guys think, any good ideas?

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