You shouldn't pick your nose in front of people.
George is in a birthday party with his friends and his nose feels itchy.
George wants to ease the itch of his nose.
George goes to the bathroom and cleans his nose.
George scratches his nose including the nostrils while the other people are around him.
The other people ask George if he feels okay and offers to give him allergy medicine.
The other people feel disgusted by George's behavior.