connoisseuristic

Referring to someone who is displaying continuous matter-of-fact knowledge on a particular topic

Sally: "Thats an interesting theory Phil however the last Fornicus posipostioppis was performed in May 1777 but Ingrid Snoutenhofen the last remaining resident of the Folly Tribe".

Phil: "oh"

Phil: "you're being a little bit connoisseuristic"

Sally: ">:|"

Phil: "I'm not sorry"