Does "classic" here mean the same as "interesting"? Is it commonly used in this meaning?
Native speaker’s answer
Rebecca
Used as an informal interjection, "classic" has the meaning of "typical" or "not surprising/unexpected." It's often used to express one's reaction to something which is typical, not unexpected, and stereotypical. The boy has used it here to suggest that the school's response to his sister not completing her project is "classic" and a typical response from a school. Ex: A: Mary is late for school again. This is the third time this week! B: Classic. Ex: That's just classic. The McDonalds McFlurry machine is broken again. When is it ever working?