That is not all in the aspect of respect. A common one I have also fallen victim to is forgetting to greet an elderly person first and letting the elderly person be the one to initiate the greeting

When I was a teenager, there was a time I traveled to the village with my mom. On our way to the church one morning, my mom walked past some group of elderly people and greeted them ( she was way ahead of me) but I didn't,( primarily because I don't know them), while passing they said "whose child is this girl that walked passed us this early morning without greeting?" Unlike in the city where you greet majorly only those who you know, in the village you greet whoever you met on the way. It's a clear indication that the person is well trained.😀... That's Nigerian culture, for you!

You actually got the real picture, thanks for sharing.