One tactic of Narcissists (scoffers, those with insolent pride) is to not only try to destroy their perceived enemy – but they also try to isolate them by driving wedges between their enemies and anyone who might possibly help them.
22 His parents said this because they were afraid of the Jews; for the Jews had already agreed that if anyone confessed Him to be Christ, he was to be put out of the synagogue.
42 Nevertheless many even of the rulers believed in Him, but because of the Pharisees they were not confessing Him, for fear that they would be put out of the synagogue;
see here and here for an explanation on how Pharisees were classic Narcissists.
3 John 1:9-10
9 I wrote something to the church; but Diotrephes, who loves to be first among them, does not accept what we say. 10 For this reason, if I come, I will call attention to his deeds which he does, unjustly accusing us with wicked words; and not satisfied with this, he himself does not receive the brethren, either, and he forbids those who desire to do so and puts them out of the church.