Hari OM
Thanks for sharing the reference.
According to the same reference, the quote is preceded by:
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Thus the talk went on, and gradually drifted to the topic of Shankaracharya. The disciple was a great adherent of Shankara, almost to the point of fanaticism. He used to look upon Shankara's Advaita philosophy as the crest of all philosophies and could not bear any criticism of him. Swamiji was aware of this, and, as was his wont, wanted to break this one - sidedness of the disciple.
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Which injects compiler's (?) own opinion on Swamiji's motivation for the response. Which goes to tell that the quote has a backdrop and no telling how complete the context may be.
Even so, Shankara gives best evidence of his own error with the famous "Maneesha Panchakam".
How Swami Vivekananda's views are misplaced on Shankaracharya, and how Shankaracharya's views are misplaced on Chandala, only seems to reflect how much our own views are misplaced
than what is really their teachings and what is helpful for our Sadhana.
Hari OM /\
Srinivas