"We are not the marrying type".
"Boys don't want to help out, so let's, we girls, shoulder everything and say "boys will be boys""
Oh damn... that ticked me off.
And this is why, people, we can't have nice things. It's the type of self-harm women do all the time, because they've been educated to do what the boys don't want to bother to do. And they end up thinking it's natural. And even manga authors perpetuate those mindsets.
When I saw the guys running away and the girls only vaguely complaining and doing nothing, I got angry on their behalf. I would have called a teacher and asked them to set things right.
Boys have to learn to be responsible and do their share too. It's part of education.