the way they explained it makes sense to me tho icl. he has different interests and didn't want to be looked down upon for being just another omega but in doing that he shamed himself into being more masculine than he wants to be. He fell for the effeminate haruka and despite being an omega he masculinized himself more to fulfill that protector role for haruka and his family. In doing so he hates the part of himself that loves cute things because he's not a typical omega now so he says it doesn't suit him but being a typical omega is what got him harassed in the first place

I don't feel like male omegas are expected to be manly? So the way his complex is portrayed doesn't really fully make sense to me. Imo it could've been presented in a way that made more sense within the universe.
Like Haruka's alpha mother becoming sexist (alphas are superior and must be perfect) as a reaction to her own father's traditional sexism (women are inherently inferior) is internally consistent