YOU SAID:

i think that white people should be less light than they are.

INTO JAPANESE

白人は彼らよりも明るくないはずだと思います。

BACK INTO ENGLISH

I think whites should not be brighter than them.

INTO JAPANESE

私は白人がそれらより明るくなるべきではないと思います。

BACK INTO ENGLISH

I think whites should not be brighter than them.