Blowing one's nose in public is a common occurrence, but there are certain etiquette guidelines to follow to avoid making others uncomfortable and to maintain good manners:
Use tissues or handkerchiefs: It is considered more polite and hygienic to use tissues or a clean handkerchief to blow your nose rather than using your cupped hands. Tissues and handkerchiefs are designed for this purpose and can be disposed of or washed afterward.
Avoid blowing into your cupped hands: Blowing into your cupped hands is generally considered unhygienic and impolite, as it can spread germs and be unpleasant for others to witness.
Step away from others: If possible, step away from the crowd or turn away from others when blowing your nose to avoid discomforting them with the sound or sight.
Be discreet: While blowing your nose is a natural bodily function, it's best to do so discreetly. Avoid blowing your nose loudly or with excessive force, as this can be off-putting to those around you.
Cover your nose and mouth: When blowing your nose, use a tissue or handkerchief to cover your nose and mouth fully. This helps contain any potential germs and makes the process less noticeable to others.
Dispose of tissues properly: If you use tissues, dispose of them properly in a trash bin. If you're using a handkerchief, put it in a sealed pocket or bag until you can wash it.
Avoid doing it at the dining table: If you are in a restaurant or a social setting where food is being served, it's better to excuse yourself to a restroom if you need to blow your nose.
Consider the setting: Be mindful of the environment and setting when blowing your nose. For example, if you're at a formal event or in a quiet place, try to be even more discreet.
Using a handkerchief is generally acceptable and more environmentally friendly than using disposable tissues, as long as you wash the handkerchief regularly. However, if you're in a situation where you can't wash it immediately, it's a good idea to have multiple handkerchiefs on hand to avoid carrying a soiled one throughout the day.
In summary, blowing your nose in public is acceptable, but it should be done discreetly, with proper hygiene, and consideration for others around you. Using tissues or a handkerchief is more appropriate and better-mannered than blowing into your cupped hands.