LPN'S in un. Mgr. Positions. How is it legal for them to clinically supervise RN's?

I'm a RN and I work in Long term care at the moment. I'm a humble nurse, but I also am a confident nurse. I handle problems when they arise, regardless of the age of my patients; patients have the same rights regardless of their age! Communication with families is a big part of my position and I strive to make them feel comfortable in entrusting their loved one(s) into our care. I've been experiencing a problem with the unit manager since I began my position at this facility one-year ago. It seems the unit manager is always trying to "check" me about what I discuss with families, why I use certain interventions with my patients, and why I go "above and beyond"! She recently accused me of practicing outside of my scope of practice, when I sat down with a family and explained signs and symptoms of a diagnosis that was given to the patient. I suppose I would feel differently about her being my unit manager if she were more polite and more educated. Education has a lot to do with clinical supervision. Since when did educating a family and knowing the disease process become practicing outside the scope of practice for an RN?