What do many people find offensive about the catcher in the rye?

I has been banned from most schools for one, it also has offensive language and sexual content.
Though the sexual content is not " bad" in nature parents often worry about it in the hands of young minds.
 also the main character of the book , Holden , thinks a LOT about sex and his friends are sexually active

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The only reason based on my own answer or some of my instinct jack flack up and down and then twist all around before taking his medicine is because the label of his medicine says that you need to shake well before using or before taking it.