peanut gallery
pea·nut·gal·lery
noun
1.
(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)
- “he ignored complaints from the peanut gallery”
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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.