Having lived in SoCal from 1969-2015, I feel fairly confident in my ability to identify people of Latino heritage.
This is not it.
I too fled SoCal a few years ago. I read the other day that the LA Unified School District, (that I was a part of,) is now 8% White! 8%. Holy cow.
In southern CA they almost all mexican. In Philly they could be Cuban, Puerto Rican, Dominican, etc. A lot of them look black but are hispanic. Not all hispanics are mexicans.