when ever I found any news about bitcoin it is negative news , i am confused why traditional mass media always against bitcoin ?
This actually depends on the media itself. There are some media supporting crypto currencies and some of them is against. As you all know that market is dominantly owned by bunch of whales and each of them own some media organizations. They all control media to manage our fears to control prices.
Not all media are against bitcoin, or reporting negative news about it. I heard once, that they are warning the public not on bitcoin, but on some groups of scammers that are using the popularity of bitcoin to manipulate the public. It is actually true that some syndicated groups are riding into the trend of cryptocurrency to fool other people. That is probably one reason some media are turning against on bitcoin.