Was she teasing him or just losing her nerve? Basically, I think its just that Japan is weird, and people are overlooking things like this. Even going so far as to let her Mother buy her A cup bras to not rouse any suspicion. Not the Goku we know at all. Does she have any idea what she is doing to me?! He'd have to show her the speed of a warrior, the speed that fought Android 18 toe to toe and outmaneuvered Majin Buu.
I agree with your first point, although they could have explained it to her better than angering her.
This is my first kiss! She couldn't get support from anywhere, even from her own parents. She tried to get down lower, but realized she hit a particularly large bump in the man's pants every time she tried. Otherwise we might not have the strength to get the balls back if anything comes up! If that isn't weird then I don't know what is.