Why is the scientific community wanting to downplay the Nimitz sighings?

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My professor for intro to earth science dared anyone to give him evidence of aliens and ufos that weren’t misunderstandings. I brought up the USS Nimitz ufo sighting

>Seen by the USS Nimitz, multiple pilots, Superhornet F/A-18 FLIR cameras, E-2C Hawkeye, and the USS Princeton
>Appeared multiple times
>Is a tic-tac shape
>No wings, exhaust, or discoloration
>Went up to mach 25 in less than a second
>big as a fighter jet
>flied and suddenly turned instantaneously with little to no change in visible acceleration
>Disclosed by the US Navy
>They admit they do not know where “it” is from, or what “it” really is
https://en.m.wikipedia.org/wiki/USS_Nimitz_UFO_incident

My professor seemed like he wanted to stop me from finishing, like he was annoyed.