Because in general if someone's never drank before, for example, it's not a sign they have a great deal of self control, it's a sign they're a socially alienated sperg.
Guys like CWC spent most of his life never having drank, smoked, etc. and what kind of person was he? The reason he didn't do those things wasn't because he was a stand up guy, it was because he was a shut in and a weirdo with helicopter parents.
And you've never used addictive substances, but you're on an internet forum, with some meme thing as your username, so obviously you have used something addictive, the internet. Do you eat junk food? Because obesity is more common at this point than most forms of actual substance addiction. Those are in some ways less respectable, because they're solitary activities.
Not consuming psychoactive substances is broadly a good idea, but it's also not something a person should expect asspats over either.