It's unreasonable to tolerate an aggressive friend.
James' friend has a habit of getting drunk and starting fist fights with strangers.
James wants to avoid getting sucked into a fight.
James tells his friend that he'll only spend time with him during the daytime where there's no alcohol.
James tries telling his friend to moderate his drinking when they go out.
James and his friend gradually drift apart and James doesn't have to witness to participate in any fights.
James' friend orders shots when James is in the bathroom and ends up getting in another fight.