I'm inclined to the idea they would consider you some kind of sorcerer. I think that fact that you killed a marauding dragon, thus saving the townsfolk will probably mitigate any fear the citizens would have. I mean, you're really weird, but you did a good thing.
Regardless, it sounds like basic math(A> B > C Therefore A > C). If the dragon was scary and a threat to them.... and you just killed said dragon.....
you just became the next big scary predator on the block eh?