There's nothing wrong with focusing on the details, but someone who is pedantic makes a big display of knowing obscure facts and details.

Pedantic means "like a pedant," someone who's too concerned with literal accuracy or formality. It's a negative term that implies someone is showing off book learning or trivia, especially in a tiresome way. You don't want to go antique-shopping with a pedantic friend, who will use the opportunity to bore you with his in-depth knowledge of Chinese porcelain kitty-litter boxes.

Definitions of pedantic

adj marked by a narrow focus on or display of learning especially its trivial aspects

academic, donnish
characteristic of scholars or scholarship

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