What type of conduct is illegal when selling alcohol beverages?

Engaging in disorderly conduct is illegal when selling alcoholic beverages because it can disrupt the environment and safety of the establishment. Disorderly conduct may include actions such as yelling, fighting, or exhibiting aggressive behavior, which can lead to a chaotic atmosphere that may encourage excessive drinking or create potential hazards for staff and patrons. Establishments selling alcohol have a responsibility to maintain a safe and responsible environment, and allowing disorderly conduct undermines that responsibility. Ensuring a calm and respectful atmosphere is critical for compliance with liquor laws and for promoting responsible alcohol consumption.

The other options, such as displaying a calm demeanor, acting politely, and requesting a drink on behalf of another, contribute positively to the service environment and do not violate legal standards related to alcohol sales. In fact, maintaining a polite demeanor and composure is essential for effective customer service and compliance with the law.