Characters
Technically, I am in Human Resources, and Dwight was asking me about human anatomy. I’m just sad the public school system failed him so badly.
— Toby • The Office (U.S.)

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker uses the shared word 'human' to connect a Human Resources role with a question about anatomy. That tenuous connection makes the explanation sound dryly defensive. The final remark shifts the joke toward Dwight, presenting a criticism of his knowledge as regret about his schooling.
Context reviewed