LOL! Yes, I suppose he is very like fanon Snape, particularly the Snape I write :D I have no issues with Snape being cruel, particularly, but I don't like that in the books he's so often cruel with no actual purpose. That's why I like Claude -- his cruelty has a reason and a goal.

harry gets sort of familiar and says something that snape almost completely misinterprets, and there is fallout. And sex, usually.

LOL! Well, in a roundabout way...