My (older) sister deeply hurt me today. When she got up, I said "good morning" and she ignored me. I followed her for a bit and I said: "Hey, good morning" and she said: "go **** yourself". I got upset with her and I left and she said: "Haha, why so serious?".
Some people don't realize how impolite they are. She's been working a trucker job for years now and she hangs out with the wrong type of crowd. You see kids, this is what happens to you when you don't get a higher education and when you work in low-wage jobs filled with grunts.
What do you wish you'd been taught?