

For the record, there is actually no necessarily discernable difference between sarcasm and lying to someone’s face. People that are very sarcastic will often not adjust their delivery whatsoever. The whole point of sarcasm is to be somewhat plausible and convincing, after all.
The only real difference is in the motive to be humorous, which is just not necessarily discernable. This is why sarcasm is usually not used with complete strangers irl, since they won’t know the person well enough to necessarily detect it, unless you grossly exaggerate it. Which is basically the same as an irl /s, where you deliver it in either an exaggerated deadpan or an almost singsong fashion to make it very blatant. Even in these cases, the person will often offer a polite apology for using sarcasm with a stranger, since it’s kinda broadly felt that that’s just not a great idea.
Ultimately sarcasm is predicated on the idea that people’s casual words should not be trusted though, which is just generally good advice anyway. Trust systems, not people, unless you know them well. Words are simply too cheap, they’re as often a toy as they are some serious information transfer mechanism.
Lead researcher has a youtube channel linked at the bottom of that article, too.