Let’s pose the question like this:
You love your teenage son. He wants something that he thinks is good for him, but you, with your wisdom acquired through twenty more years of life experience feel that this is the worst thing for him. Do you get it for him, or do you say, “I know what is best for you and I love you, and I believe that this is the worst thing for you, therefore I will not get it for you.” And if your answer is the latter, is a friend, whom one is required to love, different from a son? We are going with the assumption that we are dealing with someone who truly knows what is best for his friend, and not some phony friend whose judgment is clouded by negiyos.