They’re doing 30-somethings dirty.

For millennials, transitioning from the cool kids at the top of the generational food chain into nearly middle-aged workhorses who oft find themselves saying, “you know, back in my day…” has been no laughing matter.

Still, the teens and 20-somethings of Gen Z are constantly finding new reasons to laugh at people born before 1997.

And now, the Zoomers’ latest jab is aimed at the tight-lipped way their predecessors smirk in snapshots.

“Millennials, gather around, because I just found out that we are being bad fun of for something called the ‘millennial smile,’”Jasmine, a lifestyle influencer, from Texas, announced to over 555,000 video viewers.

It’s a look that sees Y2Kers coyly purse their lips, tilt their heads and cut a barely-there grin.

Think B

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