If sincere, this kind of action is attractive in a man. If a woman expresses her liking for you, then no matter whether she is pretty, or whether you find her attractive, you should respond in the same way, and with the same respect.
女孩子向你表示好感，不管她長得漂不漂亮、你喜不喜歡她，都應該同等地對待與尊重。