You clearly misread. Elementary and even some high school school kids don't think about "race" until it is pointed out in some way whether by a national event or cited as bullying reason etc. How you could extrapolate that to "race doesn't matter", I have no clue other than a misread whether intentional or not.
You've changed crux of your argument (or perhaps clarified what you inteded to argue) to now be what school age children do or do not think; though that isn't very compelling as neither you nor I are capable of reading minds. However the comment I did respond to was clearly written--"Race, in general, isn't a big deal when you are younger..." and it clearly can be a big deal to young people; just perhaps not a big deal to you.
I've changed nothing. You misread it and I clarified it for you to come to an understanding. Race/Skin Color/Nationality, whatever it is you want to read it as with the negative connotations assigned, isn't something any young-in thinks about on a daily basis without it being pointed out in some way.
Anyway, I'm not interested in going on circles on this. I would know about said experience given my own culture and interactions. No one needs to reads minds to give anecdotes about their life experience and talk to other people in the same situation about their life experience and thoughts about things that happen(ed) to this day.
[1] https://scontent-hou1-1.xx.fbcdn.net/v/t1.6435-9/106206584_2...
And Goku isn't Japanese either; he is Saiyan, an Alien race.
> Race, in general, isn't a big deal when you are younger
It isn't a big deal, if you're not impacted by it (colloquially known today as 'privilege').
However, what you might not believe is a big deal, is arguably a big deal to other people.
A few examples:
You may not be aware that black women in the US are 3-times more likely to pregnancy related issues than white women. There is a downstream impact on the children of those women. [1]
Separately, there still exists a serious gap in achievement for Alaska Native / American Indian children.
1: https://www.cdc.gov/healthequity/features/maternal-mortality... 2: https://www.nsba.org/ASBJ/2020/December/condition-native-ame...