You’re right this is the stereotype with ‘japanese people’. But you got to be careful with stereotypes. Even if you hear them a lot.
People don’t like if you tell them “that’s the two character traits we’ve assigned for you”. Or it may be something that has been wrong for a long time and you’re the one helping to repeat false information. It may cause all sorts of misunderstandings. Especially for the person in the group who doesn’t comply to that… Just be careful with stereotypes. It’s kind of okay in this case, because we’re discussing the stereotype on a meta level, and it’s not that much of a deal to talk about stereotypes, but in real life i’d just keep it to myself.