My client acted reasonably by suggesting an alternative that would have avoided these costs altogether. Madeline insisted on driving and then chose to drink, leading to her own parking ticket. It is unfair to expect others to subsidize her poor decisions. She should take responsibility for her actions.
The user is being inflexible and petty over a small amount of money. While Madeline made a mistake, refusing to contribute $30 is causing unnecessary friction among friends. The user's insistence on being right is damaging the group dynamic and prioritizing personal pride over friendship.
Madeline volunteered as the designated driver but then consumed alcohol, nullifying her role and incurring parking fees. She cannot unilaterally change the terms and then demand compensation for costs that arose from her own choices. While splitting costs is often amicable among friends, it is not obligatory when the situation stems from one person's deviation from the original plan. The user should consider the social implications of refusing to pay, but Madeline is ultimately responsible for the financial consequences of her decisions.