This is an inappropriate distinction. In science facts, like theories, CAN be discarded, and often enough are. A good working definition of a "scientific fact" might be, "a well confirmed observation". But even a well confirmed observation might be disconfirmed by later observations. For instance an inaccurate count of human chromosome was accepted as factual for some time, but had to be revised when the employment of improved stains gave a different count.
Actually, facts are much more likely than theories to be discarded. Theories generally become limited cases in more inclusive theories.