I hardly see the need to be more thorough about it. Surely you can't expect that— [She won't say what she's thinking, which is that she has no intention of spending the evening loitering alongside him to satisfy some desire to be a matched pair; he is so prickly over the subject of being disagreeable company. She veers instead toward:]

I don't think you would find what I have planned at all appealing. I am attempting to do you a kindness.