There is an incident in which Vivekananda warned an abuser who abused Hinduism
The Swami had an unpleasant experience with two of his fellow-passengers on his way to India. They were Christian Missionaries who insisted on talking with him on the contrast between Hinduism and Christianity. Their methods of argument were most offensive; when they were beaten at every point, they lost their temper, became rude and virulent, and abused the Hindus and their religion. The Swami stood it as long as he could; walking close to one of the speakers he suddenly seized him quietly but firmly by the collar and said, half-humorously and half-grimly, "If you abuse my religion again I'll throw you overboard!" The frightened Missionary "shook in his boots" and said under his breath, "Let me go, sir, I'll never do it again!" From that time on he was most obsequious to the Swami on all occasions and endeavoured to remedy his misbehaviour by exceeding kindness.
In this incident, Vivekananda did not insult the abuser due to the opinion possessed by the abuser but warned the abuser due to offensive comments of the person.
Unlike this, there are instances where Srila Prabhupada insulted Vivekananda and others
here amongst the educated class there is influence of all these rascals, Vivekananda, Aurobindo, and... That is one defect.
Vivekananda afaik never insulted anyone and may exaggerate people's greatness. I asked a question related to it previously.
It is generally acceptable to criticize the beliefs or ideologies of others, but I do believe that great people never insult others by taking their name.
Did Swami Vivekananda ever insult by taking names of others in his speeches or writings like Srila Prabhupada?
Note: I am asking this question neither to compare the both (Vivekananda, Srila Prabhupada) nor to criticize Srila Prabhupada. But only to know about the etiquette exhibited by Vivekananda. I quoted the words of Srila Prabhupada so that members can understand well what I mean by insulting for answering this question. So, please don't negatively perceive this question as inciting debates.