It's really pathetic. Near every instance after Fool Moon, Rudolp practially bullied Harry Dresden. And what did Harry do? Nothing. Stood there and took smack from him.
He can go up against monsters but is too chicken shit to beat up a regular mortal without breaking the laws?
He's a cop. Harry decends to that level and he's gonna have the CPD on his ass. No amount of friendship with Murphy or SI is gonna help him.