Misanthrope

Etymology

From Greek "misanthrōpos," combining "misein" (to hate) with "anthrōpos" (human being). The type was fixed in the modern imagination by Molière’s 1666 comedy “Le Misanthrope,” whose hero despises social hypocrisy so thoroughly he cannot function in society.

noun · /MIZ-uhn-throhp/
A person who dislikes or distrusts humankind in general.
What it names
It captures a settled, generalized aversion to people as a whole, not mere grumpiness or a quarrel with particular individuals.
Example
Years of disappointment had turned him into a genuine misanthrope who assumed the worst of everyone he met.
Related idea
Sharper than a curmudgeon, who is merely irritable and gruff, and deeper than a cynic, who distrusts people’s motives; the misanthrope’s complaint is with humanity itself, not just its sincerity or its manners.