Is it permissible to boycott the followers of an innovator and not greet them with the salam?

Question:
Is it permissible to greet the followers of an innovator if they are fanatical about him? And is it permissible to boycott them?

Answer:
First, we must define what bid'ah (religious innovation) is. Because many of those who claim to seek knowledge today, whenever someone disagrees with them on something, they say, "You are an innovator," because they do not know what bid'ah is. We must define bid'ah. Because many of those who claim to seek knowledge today label things as bid'ah that are not bid'ah, and whenever someone disagrees with them on something, they say, "You are an innovator." This is not acceptable and is not permissible. Bid'ah is introducing something into the religion that was not part of it. Yes.
Introducing something into the religion that was not part of it, as he said . So bid'ah is when a person introduces a form of worship in the religion for which there is no evidence from the Book of Allah or from the Sunnah of the Messenger of Allah. This is bid'ah. So whoever does that is an innovator.
And it is obligatory to advise the innovator; it is obligatory to advise him and call him to Allah, warning him of Allah. If he has confusion or doubt, the truth is clarified for him. If nothing has become clear to him, the truth is clarified for him and the evidence is established against him. If he persists after that, then he is an innovator. It is obligatory to boycott him, warn against him, and stay away from him. And whoever agrees with his bid'ah and becomes a follower of him, and does not accept advice and does not leave it, then he is boycotted like him. Because whoever agrees with the innovator and is pleased with his bid'ah is an innovator like him. So he is boycotted as the innovator is boycotted.