For many of those who are entering a career, there are some things to consider when applying or working that may affect you and your work environment. This may also apply for when entering or working at an internship.
The etiquette is important for varied reasons, from your presentation, manner of speech and interaction, and possibly how you react to certain circumstances. For examples of bad etiquette, one might say morally negative things about their workplace or colleagues if a service is not done properly, or how one may make others at their workplace feel uncomfortable with their attitude towards others.
The benefits of having good etiquette opens you to more opportunities to work with others, receiving more positive feedback, and others including yourself being more safe and positive when working. This also helps when having good etiquette during internships as it would allow you for more job opportunities and positive feedback from employers and supervisors.