Of course he isn't being facetious. He'd completely forgotten about the incident in question. Even after she mentions it, it takes him a moment to remember.

"Oh." He frowns. "Anna, I was under the influence of... something. That wasn't me. You know that."

His only interest in Anna's personal life is that she's happy. After everything that happened between them leading up to her death, he's just glad to see that she can be happy. She's not exactly the leader he once knew, but she's still his sister and she's a good person.