Falsus in uno, falsus in omnibus (false in one thing, false in all things) is a legal principle. That doesn’t stop cranks from misusing it to cast doubt on science that they don’t like. Overall, it’s just another form of black/white dichotomous thinking.
![Falsus in uno, falsus in omnibus](https://i0.wp.com/www.respectfulinsolence.com/wp-content/uploads/2006/06/falsusinuno.jpg?fit=756%2C376&ssl=1)