Not knowing how to articulate something doesn’t mean you are wrong.
Being elequoent doesn’t mean you are right.
Making someone look stupid doesn’t mean you are right.
Words are tools. They aren’t everything. They aren’t all of knowledge either.
So if someone tells you something that sounds plausible, and they’ve articulated it well, you still might know they are wrong even if you have no words for it.
They might try to intimidate you into agreeing by insisting that if you can’t give a clear explicit answer, then you must just be too irrational to accept a valid argument. But, it doesn’t work that way. Knowing something is not the same as knowing how to use words to describe that thing.
Words are very useful tools for communication. But being good at words just means being good at words. Don’t conflate it with being right, being insightful, or being exceptionally rational. Those are separate issues.