Where did you get those demographics ?
https://laraec.net/los-angeles-unified-school-district/
This linked page appears to be dated 2018 but the data may be from 2012-2013
“The ethnic composition of the LAUSD student population is primarily Latino (73.4%); the remainder are African American (10.0%), White (8.8%), Asian (3.9%), Filipino (2.2%), Pacific Islander (.04%), American Indian (.04%) and two or more races, not Latino, (1%).
“In all, 92 languages other than English are spoken in LAUSD schools. The District has 161,484 English language learner students. Their primary languages are Spanish (93.4% of English language learners), Korean (1.1%), and Armenian (1.1%) with Tagalog, Cantonese, Arabic, Vietnamese and Russian each accounting for less than 1% of the total. “
And people wonder why California votes the way that it does.