It's a normal act in the global would. For anyone to market his product, he has to condemn the other then pronounce his as the best alternative. But in this case, little did they know that without Bitcoin, no other altcoins can stand.
In recent times, some new ICO companies have been kidding about Bitcoin on Twitter, Facebook for their ICO promotion. I think this promotion way is very negative for Bitcoin. They showed that Bitcoin will be destroyed and their token will become number one. They have presented it in such a way that the price of Bitcoin will not rise anymore. I think this type of promotion is very negative in the market.