"Being adopted is not something to use for the butt of jokes. Marvel, immediately cease using adoption as the butt of jokes and issue a public apology to the adoption community."
As MSNBC.com reported, Hemsworth admitted to Moviefanatic.com he didn't get the joke when he first read it.
"The line where I say, 'He's adopted' - I had no idea that would be funny," Hemsworth said.
"When we shot that, I went, 'Is this really funny?'
"But, that's the thing. Joss is hilarious. The whole film, I was surprised how the comedy in it played so well."
Fans struck out at the "joke" in the comments section on the petition.
"How ridiculous that in this day and age our children are being targeted if they are not ours through biology. How hurtful and wrong," said Lisa Willson, whose son is adopted.
"With that one line in the movie you are showing both ignorance, and prejudice."
- Herald online