These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Base Breaker: Banri's original personality. Either people feel bad for him, because of the bridge incident screwing him over; hoping that somewhere down the line, things will work out for him, or he's a pathetic loser that can't move on from the past, and blaming his current personality for all his problems.
Values Dissonance: Kouko's father slaps her hard enough to send her to the ground and her boyfriend and friends are just standing there, not even trying to defend her (or rushing to help her). So apparently it's an acceptable way to chastise one's offspring. The father is also never criticized for his action on-screen or shown regretting it, and several scenes later he's shown again playing a part in goofy comedic scenes, implying he's been a "good" parent all along and there's no need to portray him as abusive.
It is also shown later that he does truly care for Kouko.
Wangst: Banri's original personality seems to have been defined by it, in addition to being a crybaby.