The New Yorker just had a very interesting article on the idea of Meritocracy and it covered some of the reasons why there's negativity associated with the idea. It was enlightening for me. https://www.newyorker.com/magazine/2019/09/30/is-meritocracy...
The article is in part a review of the book "The Meritocracy Trap: How America's Foundational Myth Feeds Inequality, Dismantles the Middle Class, and Devours the Elite" (Amazon link: https://tinyurl.com/y4qhruhc)
The basic argument is that "merit" is a word that pretends to be about innate ability and grit, where in reality it's a deep encoding of privilege.
EDIT: OH and I forgot the most relevant tidbit... this article says that meritocracy was a bad word right from the start: "The term “meritocracy” was invented in the nineteen-fifties with a satirical intent that has now mostly been lost. “Merit” was originally defined as “I.Q. plus effort,” but it has evolved to stand for a somewhat ineffable combination of cognitive abilities, extracurricular talents, and socially valuable personal qualities, like leadership and civic-mindedness. Attributes extraneous to merit, such as gender, skin color, physical ableness, and family income, are not supposed to constrain the choice of educational pathways."