schadenfreude

Pleasure derived by someone from another person's misfortune.
‘a business that thrives on Schadenfreude’

• ‘The 17th century European enterprise of selling and buying tickets to gawk at those confined to psychiatric institutions established there was money to be made from Schadenfreude.’

Origin

German Schadenfreude, from Schaden ‘harm’ + Freude ‘joy’.

https://en.oxforddictionaries.com/definition/schadenfreude