It's not that social norms have changed. What happens is individual people don't realize how fucked up predators are until they get older. If you observe something as a teen and are told it's "creepy" and "gross," that's all you think it is. But then you get older and realize that it's actually much more sinister than that. There's manipulation, there are systemic injustices that enable it, there are people who don't know how to spot abused kids or feel like they can't upset the apple cart without throwing their own lives away.

It's like saying nobody understood algebra until YOU took an algebra class.