I think that's bad advice. Enemy is too strong of a word, but there are conflicts of interest between you and your teacher, your boss, your team members and eve

I think that's bad advice. Enemy is too strong of a word, but there are conflicts of interest between you and your teacher, your boss, your team members and even your parents. What's best for you is not necessarily what is best for them. They may help you to achieve what's best for both of you, but not what's best for you alone. Those are often not the same things. Assume people are acting in their best interest, not yours.