You didn't use the right code words of "I'm eyeing him up to see if he gives off any insincere vibes".
Now, I can see that the right code words do make for a more immersive experience, however, I'm not particularly doctrinaire about it. Both get the job done and I will usually use the more descriptive language to describe the results ("Oh, he seems to give off a shady vibe when he says that like he may be not fully straight with you") in an effort to encourage more description on the player's side of things if they say they want an insight check on the bartender.