I wish we knew the context of their fight, because Ota says some really fucked up shit to Baka sometimes. Like when Baka said something about killing herself at the start of the manga and Ota said "Yeah, you should've done that already" with a straight face. Basically, if you're gonna say shit like that then you need to learn how to take it too.
I know it's just all gags and comedy and that it shouldn't be read into so deeply, but things like that bother me.