I think it was because he was humiliated. He was in disguise as part of his love of chivalry and romance and he expected her to know what he was and swoon at the sight of him. Instead, she was more frightened than anything, didn't realise what was going on and was not instantly attracted to him, more repelled! I think Henry had to cover up his humiliation by pretending to find her repulsive and making out that there was something wrong with her instead.

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