Assuming you're commenting in good faith, people like that would rather people like you don't know what they mean, because they're not speaking to you, and they'd really like to pretend that they're the victim when other people call them out on their dogwhistling garbage.

Of course, there's always a chance, I don't know you, that you're not commenting in good faith, that you know perfectly well that they use those terms in that way and you're choosing to provide a smokescreen for this rather than just stumbling into it by accident.