Chekov was fucking with Spock.
And Spock fucked back.
Can I translate for you?
Checov "Your sister is hot."
Spock "Not as hot as your momma."
Chekov actually tried to mutiny once. It was in Space Seed. Remember? Khan does...

And to get back to the question, maybe Spock was being coy, as usual, when it comes to something shameful his family did. Remember this:
KIRK: You did too. Sybok couldn't possibly be your brother because I happen to know for a fact that you don't have a brother.
SPOCK: Technically, you are correct. I do not have a brother.
KIRK: You see?
SPOCK: I have a half-brother.
So, Spock either meant "Technically, there has never been a successful mutiny on a starship,"... or alternatively he meant "NO, THERE HAS NEVER BEEN A MUTINY IN THE HISTORY OF STARFLEET, AND IT SURE AS SHIT HAD NOTHING TO DO WITH MY FAMILY IF THERE WAS ONE -- WHICH THERE WASN'T! SO SHUT YOUR FUCKING MOUTH, CHEKOV, AND STOP ASKING STUPID QUESTIONS!"
Lastly, I get the impression that ultimately the Discovery, its mission, and its crew, are going to be wiped from the collective records of Starfleet because of... security issues.
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