Why is everyone who is against marijuana prohibition accused of being a "stoner"?

For answering a question about "marijuana pills" I was accused of being a marijuana user because I do not agree that marijuana should be illegal. I do not use illegal drugs and I resent being labeled as a user simply because I am against marijuana prohibition. Are the people in favor of marijuana prohibition so closed minded that they resort to unfounded accusations? Now I believe more strongly than ever that those who oppose medicinal marijuana have ulterior motives. I'd be happy to take a drug test if the anonymous questioner would identify them self. I think a libel suit is in order if they had the guts to tell me who they are.