Matt_Stevenson comments on Harry Potter and the Methods of Rationality discussion thread, part 4 - Less Wrong
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He refuses to teach the advanced kind, and expects she can't perform the regular kind in any case (which she tried). Draco couldn't learn regular Patronus because, being a Slytherin, he never made a honest effort.
Didn't Harry also swear to keep what he and Draco experiment with secret? This is why he never told her about the magic gene either, unless I am misremembering things.