Wait, can't boys be idols??
They can, I mean just take a look at K-POP boybands, although alot of people still think that being an idol isn't very "masculine" for a man, even though it's 2020.
Maybe its implying he can't be a part of Muse specifically, since they are a female group? However, I do remember reading a previous genderbend doujin where Nico was both male and part of Muse, so idk.
That's how I took it, it's less about Nico not being able to be an idol and more about not being the idol he wants to be.
I'm all for cute boys but not everyone thinks the same.
