Are you trying to form some kind of boycotting because a certain supplier doesn't accept Bitcoin? I highly doubt that will ever become a reality. Remember that not even a majority of the world is using Bitcoin, and even if the majority was, the seller has no issue accepting any other form of currency as long as they have customers buying. Without buyers, it makes sense to ignore a certain type of currency, but all that matters to the seller is how easy it is to get it converted to whatever kind of currency the seller wants. Bitcoin may not be as easy to get converted to fiat, so the seller decided to not accept it. I don't see any issue in that, especially because he's running a business.