In the same way that it’s not okay to dose someone with a drug, even if you expect it to only have a pleasant effect. It is a violation of a person’s autonomy to distort their sense of reality. It takes away their ability to give informed consent and infantalizes them under your influence, placing you in the position of their superior, saying ‘I know what’s best for you.’ It might not be at the same scale as some others but the smaller scale doesn’t make it good, only less awful.