Some of it is subjective though. I reckon some people will see me as rude. My language is sometimes inconsiderate of others. I can see some people finding that rude. My self-confidence may come across as rude to some as well.
I do think I’m well mannered overall, though. Always say please and thank you. Always thank anyone who has provided me with a service. Waiter, bus driver, taxi driver, train attendant. They are often poorly paid to do difficult jobs and deserve to be respected.
Can’t stand inconsiderate drivers. They are about the only thing in this world that makes me remotely angry.
So certain things are important to me, and piss me off, but that doesn’t make them any more or less rude than me swearing. How rude something is, is often simply down to the recipient’s perception.