The Equal Protection Clause only applies in the 14th Amendment. It says: “A primary motivation for this clause was to validate the equality provisions contained in the
Civil Rights Act of 1866, which guaranteed that all people would have rights equal to those of white citizens.” -Wiki
Freedom of expression is the 1st Amendment. Can the EPC work with the 1st Amendment? Yes, if the speaker of the 1st Amendment is a non-white then the 14th Amendment can be applied as a protection from racial discrimination or ethnic background of the speaker. IOW, the 1st Amendment can protect not only the white, but also the non-white, to express its ideas, and the 14th Amendment protects or guarantees a non-white to express these ideas under his or her 1st Amendment rights.
The Equal Protection Clause in the 14th Amendment, once labeled by Justice Oliver Wendell Holmes as “constitutional argument of last resort,” is often viewed as the constitutional power that can be used against racial and gender discrimination in society. In the Buck vs. Bell this same Supreme Court Justice, Oliver Wendell Holmes, in its infamous 1927 decision, he wrote, "It is better for all the world, if instead of waiting to execute degenerate offspring for crime, or to let them starve for their imbecility, society can prevent those who are manifestly unfit from continuing their kind…. Three generations of imbeciles are enough."
What happened to the 14th Amendment rights of Carrie Buck, the Equal Protection Clause that says the right to procreate? Violated based on Eugenic principles.
This decision opened the floodgates for thousands to be coercively sterilized or otherwise persecuted as subhuman.