There’s the common racial stereotype that Asians are quiet, and also shy and silent all the time.
Sometimes this is true and there are reasons behind that.
Many of these reasons are due to cultural upbringing stemming from school and class. Cultural upbringing and values also play a part in why some Asians are quieter than others.

Introverts love quiet and their own space | Weekly Photo Challenge: Layered personalities of different colours.
I am a quiet person, preferring to lay low as opposed to shouting out every opinion. I was the Chinese Australian, Asian student in class who almost always never talked in class. In all honesty, I don’t mind being the quietest among a group of people.