The thing is, everyone’s peeves and crochets are different. People who couldn’t care less about “could care less” will, faced with the use of “impact” as a verb, geschrei the house down, and that mob that sees fifty shades of red, scarlet, and carmine over the relatively newfangled use of “begs the question” to mean “raises the question” may well pass by a “comprised of” without so much as batting an eye.
— Dreyer's English: An utterly correct guide to clarity and style, Benjamin Dreyer pub. Random House 2019 [My emphasis]
Could anyone help me understand “sees fifty shades of ...” in this paragraph?