The Most Pervasive Bigotry Isn't What You Think

I am not asking for the most nefarious or egregious or atrocious form of bigotry. I'm not asking for a hierarchy of bigots or a rank of the rankest forms of intolerance and moral depravity. I'm not asking how certain forms of prejudice affect certain individuals more than others or have done so historically. All important questions that have been researched and answered by folks much smarter than me, but that's not what I'm asking.

I'm simply asking what is the most pervasive form of bigotry today.