Calling an older person sick and disgusting for finding a younger person attractive is discriminatory toward the older. People who say this forget it isn't considered inherently disgusting to like young people because they're allowed to like eachother. People don't just age out of attractions, and an adult's ability to love a kid is no different than a kid's. Saying it's bad only because they're older comes from the same type of "it's bad because they're different" mindset as racism.