If I were to talk about how important masturbation is people start judging thinking that's ALL I do during my free time. Or they also say what Butters say, "I prefer the real thing" or something like that. It's not about that, it's about exploring and taking control of our sexuality being happy about it.
Also, some guys when they meet a girl who's open-minded they start thinking she's a "whore." No, she's not, she's not a whore just because she's very comfortable with her body and sex. And even she was a "whore" so what? it's none of your business.