People who aren't critical thinkers, or who can't step back & evaluate a situation outside of their bubble. I get it. We all have biases. Some of us work to try & understand our own biases, asks questions, find multiple sources for news, ask hard questions, ensure data matches up with theories, etc. . . There's an entire group of people out there missing critical thinking skills. My rant is less about them (that's an entirely separate rant, obviously), and more about the people who insist on debating them, with reason, logic & data to back up their argument. If the person has shown even a modicum of interest, great, have at that. If the person is unable to have a reasoned debate, please save yourself the trouble & walk away. Dad* on Facebook, love you, but it's time to walk away & give up people who blindly follow without the ability to live in reality.
*It should be noted that my father has fantastic critical thinking skills, but is somehow unable to realize he's debating with those who do not possess said skills.