A decent man who doesn't consider himself a bigot can indeed be trained to behave like a bigot if he welcomes feedback exclusively from those who consider bigotry no big deal or, indeed, an attribute to be admired.
Limit your inputs to only those that support a certain kind of self-destructive behavior, and you can be cheered with enthusiasm as you drive yourself off a cliff.
I talk about any number of things on my Facebook space. Politics. Current events. The writing life. The latest tempests in a teapot centering on fandom. Daily doings from my own life. My cats, for crying out loud. Flights of humorous fantasy. Books, both those I've read and those I've written. Movies. And occasionally, TV shows.
I am a book reviewer. I write for a glossy magazine called 'SCI FI.' The money is not life-changing, but it's a low-stress gig. Publishers send me their books. More than I could possibly read. I pick a few and write about them, put a very few others on the shelf, to be perused at my leisure, someday.