The context of the following conversation is Alex lived in Cameron's house and was incredibly messy and loud at all times of the day and night.:
Cameron says Alex is a terrible roommate..
The friend responds Which house rules did he break?.
Cameron responds They are loud and messy at all hours..
The friend responds Do they at least pay their share?.
Cameron responds Well, they think paying their share gives them the right to behave like that..
The friend responds Maybe you should withhold your share to pressure him..