not to storm on the destiel parade, but there is nothing uncommon about "good morning sunshine" he's said it to sam multiple times, too. I'm sure with them all living in the bunker they hear it twice a day.or more depending on who is with them.
Sometimes I feel like the fandom blows stuff up, but literally. This is not a "weirded out" face. This is definitely a "oh my god i haven't seen you in so long but you're so different now god what happened to you what happened to us" face.