Fu Ba was displeased by the attitude of the kid in front of him.
How could he say something like "Why would it concern you whether I win or lose in the conference" when seeing as he, Fu Ba, was responsible for registering people there, making him also responsible for disqualifying them.
The number of people with special talents was greater than the number of alchemists. This was because only a minuscle number of people could become alchemists, while many others were incapable of walking down that path.
Those who couldn't become alchemists chose to become doctors or poison masters, instead.
If all of the doctors or poison masters who came to apply were allowed to participate in the conference, then wouldn't he have to spend the entire day recording names? Wouldn't the ensuing large number of people water down the conference?
Although "Chef" was a nice-sounding title, they were, in fact, just mere cooks.