Sam's too tired to purposely push the vitriol and Lucifer is just the opposite. He does read it as an accusation and he does bristle, too tired to not be so easily wound up by the one person he doesn't want to lose his cool and reveal too much to.

"And should I not?" he sneers. "Do I not have the right to support anyone?"

Support Wanda.

Support her.

Either would have been preferable.

He was doing so well.