The best thing to do here is to refuse to join him in what he is doing and also try to discourage him from engaging in such practices.
The reason why I have to try to stop him is the fact that it is unethical to give out false information and apart from this, his behavior would have a negative effect on the people that he does this to.
Ethics can be described to be the moral guidelines and rules that are intended to guide behavior.
Read more on ethics here:
https://brainly.com/question/13383200