In-book, Holden's eloquence is part of his villainy, he's the dang devil 😈

And the other characters are heavily contrasted with this

The kid's terseness is a mild parody of B-movie westerns. Looking at a severed head, ''he spat and wiped his mouth. He aint no kin to me, he said.''

And as the author, mccarthy has a stylistic purpose to writing that way outside of the holden character

This latest book is his most important, for it puts in perspective the Faulknerian language and unprovoked violence running through the previous works, which were often viewed as exercises in style or studies of evil. ''Blood Meridian'' makes it clear that all along Mr. McCarthy has asked us to witness evil not in order to understand it but to affirm its inexplicable reality; his elaborate language invents a world hinged between the real and surreal, jolting us out of complacency.

Quotes are from nyt's 1985 review https://www.nytimes.com/1985/04/28/books/blood-meridian-by-cormac-mccarthy.html

My point being, don't go pretending you are the devil or pretending you are Cormac type guy that's cringe