It's really a mixture, depending on what level of society you are in.
You may have to excuse yourself in polite company to blow your nose, or if you hang out with those ruffian types, a snot-rocket from each nostril followed by wiping with your sleeve might be the norm. Also depends on how noisy blowing your nose as well, as the thick mucous sound with a particularly blocked passage can be considered rude, and an "excuse me" might be all the acknowledgment needed for that instance.
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