You have (I assume) a copy-and-paste error: the phrase "The concept of culture" appears out of the blue in the middle of a paragraph, where it doesn't make any sense.

For what it's worth, the name "Nacirema" triggered my something-funny-going-on-here detectors right at the start, at which point it was all rather too obvious. Perhaps it's only for that reason that I found it a bit long.

(I liked it anyway. Were you inspired by this book?)