well i can show them the same for fiat, so it does not make sense that they believe bitcoin is only for drug only, unless they are really stupid or something, everyone should've an open mind at least partially
When the mainstream media is portraying Bitcoin as something demonic, which is associated with child porn and illegal drugs, it will be very hard to change the normal people's opinion. Even if you argue in favor of Bitcoin, some of the people are going to think that you are either a pedophile, or a member of some drug cartel.
There is only one option to counter this --- social media.
Public opinion and perception of bitcoin will change over time but nothing much we can do about their ignorance currently. Once they see the benefits of bitcoin they'll come around eventually. All we can do currently is to just keep spreading the word and trying to educate people in whatever way we can.