It's not that the question is strange, perhaps it's just the way it's phrased-- not to mention, given in answer to another question. He resolves to take it as a no, the mushrooms aren't hers.

"I-... suppose not," he admits, offering a sheepish smile. He finds that he's blushing faintly, and angles his head so that it will hopefully be less visible: unfortunately, he's ginger, and that's worse than impossible. He glows.
"I've never seen you before."