Is The Goldfinch inappropriate?

I've been hearing whispers lately about the novel "The Goldfinch" and its potential inappropriateness. Could you elaborate on the concerns surrounding this novel? Specifically, are there any explicit scenes, language, or themes that may be deemed inappropriate for certain audiences? Also, has the book faced any controversy or criticism due to its content? Understanding the nuances and potential sensitivities of this work is crucial for responsible readers and book clubs alike.