The phrase "peanut gallery" refers to a group of people who criticize or make fun of someone from a distance, typically in a loud or disrespectful manner. Full definition
«Advice from Peanut Gallery» What can Gov. Cuomo learn from another big State Governor like California's Jerry Brown? (nystateofpolitics.com)
«Open» — all comers, beginner questions welcome «Pro» — no beginner commentary (perhaps a «side» thread can be created for peanut gallery discussions) (climateaudit.org)
Peanut gallery comment: this whole situation is often portrayed as Russia favoring Trump but all the stuff you pointed out helps paint the actual picture, which is that Putin personally hated Hillary Clinton and backed literally everyone who was not her. (politics.stackexchange.com)