I think you make an important point about experiencing Catholic sex negativity from the outside. University is one thing, but the bulk of Catholic education takes place at the primary and secondary levels.
As an LGBTQ advocate and writer, I’m constantly exposed to the evidence of the toxic effect Catholic teaching has on youth who are not in Catholic schools out of any free choice.
They attend the schools because their parents send them there, and then, if they happen to LGBTQ, they’re injected with shame.
As you observe, many young people shake those messages off. Tragically, many don’t.
Damage is pervasive, and in many cases severe. I see the effects of it every day. It’s really sad. Nobody should be taught to be ashamed of who they are.