I don't know.
I've been seeing an increase both in the number of people who are proudly callous (mean, contemptuous, rude, pitiless, insulting) and in the degree of callousness. Probably a sign of imperialism: aggressive regimes desensitize their citizens to make more effective soldiers - and more uncritical supporters of militarism. Empathy doesn't go well with fire-bombing strangers' homes.
("Hah! Why did he bring his kids to a war zone?")
As far as survival of the fittest - which means, the one best suited to a prevailing environment - goes, yes, the callous and pitiless are thriving right now. That doesn't mean it will always be so: environments change - mostly because the callous people are destructive.
You can't not see this guy for what he is, but you want to refrain from saying it. OK, that really means, refrain from saying anything substantial and meaningful.
The mean person and myself we have different criteria.
Accept that you and he have different value systems (He? gender not specified - somehow i'd find this more depressing if it's a woman or the member of a minority... That's just my peculiar criteria.) In a better world, people with different criteria might discuss their perspectives and come to an understanding - at least agree to disagree and leave each other alone.
Mask has to be the answer. Like a medieval pot helmet - hard and shiny; nothing goes through, nothing shows through, nothing sticks. How to talk without saying anything? Perhaps repeat back what he says, as a question. Make him repeat himself. More thoughts later.