Have you SEEN the Sakana fandom? I highly doubt Yuudai's the only person who could fall in love with Taisei for being weird.
Well, OK, fine, maybe only person in the cast. But I doubt the world. I think Taisei's dating pool is limited by his initial weirdness (almost scared off Yuudai) and the fact that his line of employment surrounds him with mostly ultra-serious business types, or people who pretend to be that, like Sasaki