Aww… Bummer. I am RH positive and out of the cool alien club, I suppose.
Or, at least, so the records say. I have never received blood, so it's not like I would have any experience to evident toxicity of some sort, and I have no reason to doubt the record.
Oh well, guess that means I need to create my own cool club. Hang on… I'm about to actually put forth some effort at something….