I think this is actually a fascinating difference between the cultures surrounding Slack and Discord. Both use this language—in fact, Discord uses it much more liberally, sprinkling all sorts of silly things around the UI—but because Discord is
meant to be casual, it doesn't come across as cringey like it does in Slack.
There's lots of little details about Discord that make this work, too, from the layperson-readable changelogs written with an informal, friendly tone, to the Discord YouTube channel, which from what I can tell is basically just Discord paying some young people to do whatever they want to transparently market the product to Gen Z in a genuine, non-patronizing way.
I'm of the opinion that Discord has a much better user experience than Slack, and the only reasons I don't campaign to switch my lab over to it are:
a.) Slack has entrenchment/status-quo advantage, and
b.) Slack says it's "for professionals" while Discord targets "normal people", and heaven forbid we not use the product with "professional" stamped on it in our highly "professional" workspace!
TL;DR: I wish Discord would launch a marketing campaign targeted at middle managers saying "professionals use Discord too", I'm pretty sick of Slack at this point.