This is a totally false statement and if the poster has even looked at the general stats in the rest of the work force they would know this.

UAL has gone after, given and promoted gender, race and cultural equality for at least 45 years. For the record check out the mix in other professions:

2019 Law School Diversity Report: JD Enrollment by Race & Ethnicity (enjuris.com)
Fast Facts: Degrees conferred by race and sex (72)
Labor force characteristics by race and ethnicity, 2018 : BLS Reports: U.S. Bureau of Labor Statistics

So the question really is why isn't there a bigger pool of non-white males wanting to become airline pilots?

I guess only personal prejudices and narratives is what counts these days, not the facts!