It irrationally irritates me.
Examples:
"I love a flared jean" Jeansssss used to be jeans. Not a jean- that was my mum's friend. Jean.
"Just finishing the look off with a red lip" What colour will your other lips be. We used to say red lipsssssss.
Same goes for "a smoky eye", don't you make them both up?
And don't get me started on the POP of colour that apparently gets added randomly.
That feels better.