There's weight to OP's speculation, it's not /x/. (((They))) are raised to see themselves as blending in, that's why the MSM and Hollywood labor endlessly to make the blending seamless and harmless to normies. IMO, they know that they have normies from birth to age 25, then the more intelligent whites raised outside cities start excelling and the patterns of nepotism, characteristics, and political agenda surface. This is they propagandize so hardcore, to convert the blind quickly, and filter out any masculine, independent thinking white "goyim" from influential channels. See Alex Jones, Sam Hyde, even Candace Owens, the filter wrangles even those who go off the pasture.
It's not a supernatural ability, it's instinctive observance that is likely genetic and definitely instilled in them from birth. Another anon itt is correct, they do shit test publicly and privately, at parties. One thing I noticed immediately when I moved to a major coastal city: they quickly tell you they're Jewish and gauge your reaction. They want affirmation that you see Jews as suffering, misunderstood, intelligent and wonderful. They also more and more fish for agreeable anti-white pro-multi culti sentiment. It's alarming. Imagine telling new acquaintances you're Christian or have ancestors from Europe in casual convo.
They judge Euro-sounding names as glass half empty. Once you're redpilled it's admittedly common to view their surnames the same way. This is NOT a new thing. Jews are hyper sensitive to their names and features popping up on the radar, that's why they always say they were banned from country clubs, which they were. Trump's Mar a Lago was the first club in Palm Beach to openly admit Jews.
In 2018 though, tensions perceived of real have exploded. Jews have a defeatist tendency and need, really need to feel the enemies are out to get them, to justify their bias as the chosen people.
Alarming. This is how it was in the 1930. But now NYC LA's influence can't fend it off.