peanut gallery

(noun) (figurative) people whose criticisms are regarded as irrelevant or insignificant (resembling uneducated people who throw peanuts on the stage to express displeasure with a performance). Synonyms: peanut gallery. Example: "He ignored complaints from the peanut gallery."

(noun) rearmost or uppermost area in the balcony containing the least expensive seats. Synonyms: second balcony, family circle, upper balcony, peanut gallery.