Even though it’s a German word it is also used in English: https://www.merriam-webster.com/dictionary/schadenfreude . I don’t see any problem with OP using this word in their comment.

"Schadenfreude" is widely used term in English and isn't used to show off. If you didn't know if before then you are one of today's lucky 10k[0]

[0] = https://xkcd.com/1053/