Complaining and blaming doesn't get you a girlfriend either. I am also sick of it. That's why I am building a new civilization. In the new civilization people will learn that acne is a skin issue, not contagious cancer.
I doubt your new civilization would be any different. The issue isn't that people think acne is a "contagious cancer"; it's that acne is a skin issue -- in other words, it's an objectively unappealing trait. For this reason, I don't think most people need to "learn" anything; they're already correct: people with acne are, to some extent, aesthetically unappealing.