Since we have a female aristocrat, do the male equivalent.

Snooty and condescending to the "lower classes", convinced of his own superiority. Theoretically trained with classical knowledge, had a fencing instructor, knows high-society manners, but get him out on a street and he's totally lost. He's down on his luck just enough that he has to actually get a job, but still thinks most work is beneath him. He has read a few highly romanticized detective novels and thinks that he could to that, after all, it's just looking at a crime scene, analyzing a few clues, then talking to suspects. All nice and civilized.