You might be surprised.

They generally don't use the full word, but I have 1,000% heard people shorten it to cringe. It's mostly people that are millennial or gen Z though.

Using cringeworthy off of the internet is itself a bit cringeworthy. But I notice younger generations are no longer making such distinctions. So maybe this is becoming the norm. Older generations would not have done this. Except for really old generations, like boomers, who will occasionally throw in an Internet slang they picked up recently. Again young gen x and older millenials had this one figured out, just like we figured out technology on our own. Which is probably related, as we wouldn’t use those terms offline since we knew other generations wouldn’t understand. Now that all generations access the internet all the time, on the mainstream monopoly services, that distinction is no longer there.