If you think that's bad, you should check out the game system for "Children of the Sun" - dieselpunk fantasy, a lot of player races, and for each race, there's a section on "Why you don't want to be one of these" - for example, with elves "Everyone hates you, and they blame your race for everything wrong with the world, and for the most part, they're right".
Some are simple and obvious, like for the fish people "If you dry out, you start taking damage".
Humans however, get "You're fertile with everything, and everybody knows it". Half-breeds creep everyone else out, and Humans are the only source of it, since nobody else is cross-fertile. And yet they also get the reputation that because they _can_, it means that they _will_. Humans really are the ultimate sluts of that world.