MANAA, the Media Action Network for Asian American, called certain jokes on the show as "racially insensitive", reported Variety.
"Our community can't continue to be the target of racially insensitive jokes," MANAA wrote in the letter.
"Considering the consistent feedback from our community and television critics in general-and the creators saying they hadn't properly defined their characters nor gotten used to their actors when they shot that first episode-this sounds like a no-brainer."
The pilot episode of the sitcom which screened at Fox's Television Critics Association panel earlier this month and featured one character (Martin Mull) calling Asians "Orientals" before telling his son he didn't trust the Chinese and "there's a reason Shanghai's a verb".