Modern life has introduced new forms of public nuisance, ranging from loud video calls in cafes to improper disposal of vaping devices, according to etiquette expert Julius F. Smith.

Smith, a former royal butler and founder of Regal Afternoon Tea, has identified several behaviors that test public patience, emphasizing that common sense and consideration for others are key to good manners. He notes that while most people are considerate, a minority's lapses in public etiquette can negatively impact the experience for everyone.

One common issue is overstaying one's welcome at a coffee shop, particularly in smaller independent establishments. Smith advises that occupying a table for extended periods without ordering additional items can be detrimental to businesses already competing with chains and remote work trends. He suggests that cafes are not intended as libraries and patrons should move on after their visit to allow others access.

Public grooming on transport, such as clipping nails or applying makeup and perfume, is another area of concern. Smith recounts an instance on a train where the strong scent of perfume made the journey difficult. He recommends preparing before leaving home rather than in public spaces.

The habit of playing long voice notes or having speakerphone conversations in public also disrupts the peace. Smith finds it baffling when individuals play extended voice messages aloud, deeming it a significant public annoyance, rivaled only by phone conversations on speakerphone in quiet carriages.

Social dining can also be marred by disputes over splitting bills. Smith clarifies that the host typically pays, or if a shared cost was agreed upon beforehand, the bill should be divided evenly without detailed itemization, to avoid unnecessary awkwardness.

Consuming pungent foods in enclosed public spaces like trains or planes is another pet peeve. The strong odors of certain meals can be overpowering for other passengers, as illustrated by an extreme example of a family removed from a flight for bringing a strongly-scented curry aboard.