You build relationships by developing a shared sense of how we expect to behave with one another, and how we value one another. It’s not magic. It doesn’t happen just because we really, really care about them, although we must. It happens because we *demonstrate* that care through our behaviour, and our expectations for their behaviour.
If you believe good classroom culture is based on relationships then you’re right, but if you think those relationships aren’t achieved by structure, routines and consistency then you’re probably wrong.