Somehow it didn't register for me that men didn't exist in this world...
It being Yuri I didn't think much of the fact that all the important characters are women, but I guess my brain assumed there were a few men among the background characters drawn
I mean if she was a real person and I was her age if probably get mad at her and ask what her deal is, but she's not and I'm not. She's a character in a teen harem/romcom thing where things frequently get exaggerated for emphasis, in this case her unwillingness to show that she cares about Sora...