I think what's so bad about him only dating hybrids is that it makes it looks like he's only after their looks and not him as a person (hybrid). Like imagine hearing your significant other saying "I only dated and liked you because you're tall". In this world, it's even worse since they have a previous history of humans looking down on hybrids so in this situation it makes look like Kang is just dating him for his sexual amusement, nothing more than an object of his kink. Plus this is also worsened by the big brother instilling doubt and bullshit to him. So now we have this fuckfest.
I think what's so bad about him only dating hybrids is that it makes it looks like he's only after their looks and not him as a person (hybrid). Like imagine hearing your significant other saying "I only dated and liked you because you're tall". In this world, it's even worse since they have a previous history of humans looking down on hybrids so in this situation it makes look like Kang is just dating him for his sexual amusement, nothing more than an object of his kink. Plus this is also worsened by the big brother instilling doubt and bullshit to him. So now we have this fuckfest.