I had a "friend" on FB a while back that posted a meme about Reagan that was completely false. I don't remember what it was, but that is irrelevant at this point. I first politely said that his numbers were off and Reagan never did what he claimed. He insisted that I was wrong. I then found numerous sources that proved that what he claimed was incorrect. I posted the links to those sources. Much to my surprise he admitted that he had been mistaken after reading the sources. You would think that would be the end of it. Maybe he would even delete the post.
Later that day (after admitting that what he posted originally was incorrect) he posted another version of the meme claiming the exact same thing. When I pointed out that he had already admitted that the information was incorrect, he told me that it was his FB page and he could post whatever he wanted on it, then unfriended and blocked me.