Not Here, Not Now
Certain activities are best suited for specific times and places, and nail clipping is one of them. It's generally considered inappropriate to clip one's nails in public, especially in shared waiting areas like a doctor's office. This scenario has occurred frequently enough that the doctor's office found it necessary to post a sign with a visual aid to remind patients not to engage in this behavior while waiting.
Respecting common courtesy and societal norms helps create a more comfortable and respectful environment in shared spaces. Being mindful of where and when certain activities are appropriate is an essential aspect of good etiquette.