tiny infractions of social rules.
A sneeze is a tiny infraction of a social rule. Other bodily functions are generally bigger infractions. An infraction is a breaking of a rule. Introducing the older to the younger is a tiny infraction.
You can get away with a little, but don't try to push it!
You can sneeze, if you use a handkerchief, but don't sneeze in my face.
You can make an extra trip to the washroom, but don't stay there all afternoon.
You can be late for work once a month, but if you do it every day, you'll lose your job.
Student or Learner