Given the tweet "People were always afraid that stodgy squares would kill rock and roll, but the only legitimate threat was ever child choruses.", classify the sentiment expressed by the author into one of the following categories: 3: very positive emotional state can be inferred, 2: moderately positive emotional state can be inferred, 1: slightly positive emotional state can be inferred, 0: neutral or mixed emotional state can be inferred, -1: slightly negative emotional state can be inferred, -2: moderately negative emotional state can be inferred, -3: very negative emotional state can be inferred.