1
Without a doubt those subconscious tendencies exist. The question becomes whether the CONSCIOUS anti-bias cancels it, or trumps it, or what.
The pool of MLB umps is a small one, and not representative of society, and well-trained; that their "diversity" training might trump their "lizard brains" is an interesting question. Looks like you two have a couple of interesting reads as to where the final outcome wound up.
:- )