Yes, this is sarcasm.

Meme stolen from everyone:
When you see this, post another Supernatural quote in your lj.

Ruby: "I'm telling you the truth"
Dean: "And I'm telling you to shut up, bitch!"
Ruby: "I'm sorry, why are you even a part of this conversation?"
Dean: "Oh, I don't know, maybe because he's my brother, you black-eyed skank."

Yes, this is sarcasm.

Meme stolen from everyone:
When you see this, post another Supernatural quote in your lj.

Ruby: "I'm telling you the truth"
Dean: "And I'm telling you to shut up, bitch!"
Ruby: "I'm sorry, why are you even a part of this conversation?"
Dean: "Oh, I don't know, maybe because he's my brother, you black-eyed skank."