i decided to skip most of the thread because i honestly don't give a shit right now

i'll read over the rest of it later
one idea i came up with is discrimination based on blood type. the actual idea may be a bit ill-conceived, now that i think about it, but the gist is that more common blood types are in the lower rungs on the social ladder while the rarer ones are at the top. however, there's one exception: people with type O-Negative blood are at the very bottom, though not in the way you'd think: while people with the most common blood type(s) are the ones that are essentially slaves, O-Neg people aren't so much worked as farmed, kept in containment and fed (by force if necessary) to keep them producing blood that can be used for whatever reason. this sounds like it would fit best in a vampire society, but i had envisioned it as being just by plain ol' humans.