Laughing at other people's expense [closed]
Solution 1:
Schadenfreude, a borrowed German word, is a common and concise way to say it.
Enjoyment obtained from the troubles of others
https://www.merriam-webster.com/dictionary/schadenfreude
Solution 2:
According to Wiktionary :
epicaricacy (uncountable)
(rare) Rejoicing at or deriving pleasure from the misfortunes of others.