“For younger people, the thumbs-up emoji is used to be really passive-aggressive,” a 24-year-old Redditor wrote. “It’s super rude if someone just sends you a thumbs up,” they added.

To Gen Z, that classic smiley face emoji isn’t all sunshine — it’s more of a smug, side-eye smirk that can come off as passive-aggressive in texts like above. “Emoji use may be related to ...

(Interestingly, no emoji has ever been deleted from the Unicode set.) There are now 3,790 in all (including the eight newest). According to Unicode, 92% of the world’s online population uses them.