Because the meme has become ubiquitous, knowing when to deploy it separates effortless humor from embarrassing misfires. The rules of engagement depend heavily on the severity of the content.
The term shines when the situation involves mild absurdity, self-inflicted minor chaos, or unapologetic selfishness. If an influencer admits they bought three iced coffees in four hours simply because the barista drew a smiley face on the cup, commenting "fairs" hits the exact note of ironic complicity. It works equally well when responding to petty acts of vengeance that nobody would defend in court but everyone secretly understands.
Conversely, dropping "fairs" under serious trauma, actual accidents, or genuine socio-economic struggles reads as callous rather than clever. The joke requires low stakes. If the consequences in the video involve genuine suffering, the irony vanishes, leaving behind an insensitive remark that routinely gets downvoted or deleted by creators.