Nemo is just the kind of person who doesn’t like people disliking her, and for no apparent reason at that. She’s shown far greater interest in Kuro and both her and Yuri have had greater development with Kuro than eachother (and likewise get jealous over Kuro). Honestly ‘NemoYuri’ seems pretty out of nowhere and everyone seems to be using that one incident as a means of evidence, but honestly I got zero romantic vibes from these two.