If no one knows them or their identity, this is permissible.

if we share any funny incident of people, without knowing them and without taking their name, and we laugh at it . . is it backbitting? Since we don’t take or know their names !

Backbiting | May 11, 2014 5:13 am
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What does backbiting and slander really mean in Islam?
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Is it BACKBITING if a muslim woman tells her “husband” and other sisters etc. about a sister she went to visit at a hospital that was BREASTFEEDING her newborn infant at a hospital. She told the breastfeeding mother that its forbidden to breastfeed in front of others. How true is this?