The real question is really whether or not he’s sticking the bird at Alex Trebek himself, who is only trying to learn about the guy’s mathematical formula for eating pizza the right way.
(Alex has been known to get fresh on occasion, though, so maybe there was beef backstage.)
We should all be so lucky as to know how to eat pizza smarter.
Considering how much focus went into keeping that single digit extended, I don’t think there’s any possible way for Mr. Viraj Mehta to get away with any explanation that doesn’t include the sentence, “Yeah, I was definitely sticking the finger just then when I was telling my story in my sweatshirt.”