
I'm sure it's because it was indicated in their world that majority of the men are supposed to be alphas. Male omegas were extremely rare as after all that even extremely recessive alphas exist, as if even an alpha clasification have hierarchies of its own.
Jin hyeon probably said that to reassure eun jae that

( Reply revised cause i posted the draft lol )
It's because it was indicated in their world that majority of the men are supposed to be alphas. Male omegas were extremely rare.
Point is, Jin hyeon probably said that to reassure eun jae. Knowing eun jae's overthinking nature, he said that to emphasize the fact that even if he was to turn out to be an alpha in a world where an alpha x omega relationship was the norm, he shouldn't worry about their relationship crumbling because he "hates" omegas anyway rendering future relationships with omegas impossible for him.
It was honestly sorta dumb because they all know that there's always a possibility of a guy being an omega- ╮( ̄▽ ̄)╭
I just want to know what Jin-hyeon was thinking trying to impress him by being sexist towards omegas lol?? Should he not have realized that if MC actually was an omega then he'd be screwed? And if he was just being honest then mc has every right to fear telling him about his sub-gender. The sexism gotta go, Jin-hyeon