Why are there no American Flags in the Classroom?

On a recent visit to one of FMSD charter schools, I noticed their were NO U.S. flags hanging in any of their classrooms. I asked the principal why there were no American flags in the classrooms? They responded, "That's how it is in all our classrooms."

I later communicated that it is a requirement in the California Education Code:

California Code, Education Code - EDC § 38117

My question is besides the requirement, why would we NOT have the symbol of patriotism and freedoms we enjoy in America be in a prominent place of display in EVERY classroom and building in our schools?

On another visit to one of our FMSD middle schools, I observed an LGBTQ+ flag hanging in the front of a classroom in place of the U.S. flag. There was NO American flag in that classroom!

I brought that to the Superintendent's attention. How would parents of FMSD children ever know that a teacher or teachers promote their personal preferences in their classrooms instead of posting the American flag, which is required by California Education Code and FMSD Board policy?