if everybody or even a celebrity started saying bad about bitcoin, they will run for their money crashing the price. Compared to that, altcoin users are more technically oriented ones. They know about blockchain, they know about the technology that particular coin is offering, and they are betting on that uderlying technology, not on some mass speculation.
According to what you are saying, if they talk bad about bitcoin the price crashes which is not a lie but the prices of altcoins are dependent on the price of bitcoin anyway so when the price tanks, altcoins go along with it. Also very few people care about the tech, majority are just here to make money so forget about talking about tech, everybody wants their coin to pump