I was told that (Serge) Lang has never fallen in love with categories, to use a polite euphemism. Other people claim that, in some occasion, he has even declared his lack of interest in the subject in a somewhat harsh tone. However, I couldn't find anything (explicit) in his work in favor of these claims. Is there any document (a letter, a paper, a book, ...) where one can clearly read about his point of view on category theory? Is there any anecdote or personal episode that you could eventually tell in respect to this?
From p.105 of the first edition of Lang's Algebra, under the heading EXERCISES:
In response to amWhy's comment, I looked at the Revised 3rd edition of the book, where the section on Homological Algebra contains a much kinder but still recognizable version of the above:
According to this MO answer, the quote is unchanged between the first and second editions.