I currently attend a Catholic High School. Though the staff are pretty Catholic in morals and teaching, many of the students are a different story. We had a marriage talk at our school. It was about how to commit in relationship and give of yourself to your spouse. However, there was a big deal about it on Facebook, with one person going so far as to say they were going to preach against adopting children
. There were quite a few people who didn't attend because they thought it would be on homosexuality. It wasn't mentioned once. So yeah, I don't think Catholic schols are immune to it, though I would say there is less of a backlash for being Catholic about it.