But it was an article about the merits of one programming language, in which the author made erroneous and ignorant remarks about another programming language,

But it was an article about the merits of one programming language, in which the author made erroneous and ignorant remarks about another programming language, and other ignorant remarks about programming language features (mild ones like associating static typing with verbosity). It's not as if they made some flawed remarks about mathematics or electrical engineering, which truly are different fields. For me, it detracted from the author's credibility, because they apparently don't have a breadth of experience with programming languages, so why should I take their opinions about this one particular language very seriously?