The moment she arrives, Simon the Pharisee is given some fuel for his prejudice by what she does. You notice he says to himself ‘this man’; that is interesting.
How often people misjudge the Lord! They start with such a low view of him. They assume that he lacks power, that he lacks knowledge, that his reasons for acting are not wholly good. They assume that he has no knowledge of their thoughts, that he knows no more than any other human being, when in truth he reads our inner being perfectly and nothing can be hidden from him. They assume that he does not know the future any more than we do, but Scripture tells us he knows the end from the beginning. He is Alpha and Omega, the beginning and the end, and his plan never deviates off course for a moment. He knows why he has created all thing and where they are heading. They assume that he cannot stop the evil that goes on in the world and that though the gospel has been in the world for 2,000 years, it has achieved little. They assume that his words will fail and his predictions are no more accurate than human prognostications, but in reality his words can never be broken. They assume that he has forgotten all the evil that has been done in the past, but the Day of Judgment will reveal that not the slightest detail has been overlooked. They assume that the effect of religion is merely psychological, and that there is no reality to claims of conversion. In all these things they misjudge the Lord, and yet he does not instantly correct them, but leaves them trapped in their misunderstandings. Simon had seriously underestimated the Lord, but we must never do that. In fact it is we who do not know what is going on, not the Lord; he is always far beyond us in his understanding. But the Lord remains quiet initially, allowing Simon to make this great error of judgment, so that a lesson can be prepared for him and for us.
Our misunderstandings arise from our prejudices, and we are culpable for our misunderstandings. We do not want to believe in a God who knows all things, who reads our hearts, who has our future in his hands, who is going to judge all who have ever lived. Sometimes they arise from ignorance, but we mishandle our ignorance, and instead of making humble enquiry and giving God the benefit of the doubt, we jump at the opportunity to find fault.