A friend of ours converted to Catholicism in the 90s. Her father was Catholic (but lapsed) and her mother Protestant. While she was in RCIA and after, her mother seized every opportunity to spew bad things about Catholics--including the point where they walked past a church and her mother said, "You know that's where they buried all the babies the monks and nuns had together; after they're born, the nuns kill them, and they bury them under a church." Now that was painful--especially since she and her mother otherwise had had a pretty good relationship, except for religion! I think her mother finally gave up talking to her about it; our friend wouldn't cut ties but wouldn't give in, either. In one place we lived, our pastor took part in interfaith dialogue. Every month, ministers from throughout the county met at a different church, and he went to all of them, no matter how far. Then it was his church's turn to host, and one minister came. One. That priest never went to another meeting.

I know anti-Catholic discrimination and even hate still exist, but I tend to think of it as being in isolated pockets, and usually involving older people who grew up that way.

No, it's not in the same league as RaceFail; one of the worst aspects of the latter is that I keep seeing it from educated, literate people who ought to know better, and women, who ought to know it hasn't been that long since they were treated the same way they're treating people of color! This appears to be a lone wacko who doesn't even have a website, and another Protestant ministry with a similar name clearly disavows his effort, which is some consolation.

Yet, as you say, some people will believe it, especially seeing it in print.