Maybe so, but its a mistake to assume others are falling for it just because they don't outwardly react to it. Ignoring it is the low-effort route that gets you through the day, so most people will usually do that.
But, you acted as if there was something wrong with those who dont. And as if there was some higher value in enabling and playing along. I disagree with both.
If you really wanna out a liar and come out clean on the other end, it's just so much documentation, emotional decision trees, how to phrase & frame & present things, etc. etc. etc.
Often, the compulsive liar will out themselves, create their own demise, or be enabled and further empowered by a toxic system that rewards such types (which if possible, you'd wanna get out of ASAP because prolonged exposure leaves lasting damage to anyone in such systems).