There are so many people all over the world in this apartment.
Sometimes I feel cultural difference although I like.
Here is the example.
Japanese are strict, so they use polite language to others for the first time.
But for not Japaese mother tongue, it is not good for communication.
They may not understand you because Japanese are complicated and difficult language.
It is foggy and deep language, inferring always with you so need to consider what they want to say truly.
So I prefer to use casual Japanese even you are older than me!!
Actually it is so hard because I want to be polite.
Position or age, something like that, are important especially for Japanese culture.
But I dare be sort of rude for better communication!!!