Re: AVENGERS: Grade, Reviews, Discuss, DVD & Sequel **SPOILERS**
I didn't take the joke about Loki being "adopted" (strictly speaking he was baby-napped) as being against adopted children just as someone said above it was Thor's way of "distancing" himself from Loki by saying his bloodlines aren't the same as Thor's.
It was a simple, small, Whedonistic joke nothing more. I doubt it was Whedon's way to insult people who've been adopted as I see no reason why he'd even want to do such a thing. Those upset about it are making mountains out of molehills over a nothing line. It's like the ado that was made over the infamous "don't go full retard" scene in "Tropic Thunder" where special-needs groups got all upset over the pejorative rather than catching the meaning of the scene/message.
Thor's line was a simple joke that Loki and he do not share any ambitions or likeness by blood.
Omg people are getting worked up about that line
I thought it was obvious Thor meant it as distancing himself.