It annoys, when people swear out loud.
Walking down a Wal-Mart aisle and hearing swearing
from the employee 2 aisles over is what I mean by "out LOUD."
More annoying,
it has become incorrect to ask people not to swear.
If asked, you are viewed as a stick-in-the-mud and then someone swears at you (to mock or intimidate).
Even if his or her words don't say it, rolling of the eyes does.