When new employee immediately ignores certain co-workers, did she basically study the employee directory (who’s a CEO, who’s a janitor, etc)?

Let’s say her position requires a college degree, and she ignores a male co-worker (who said “good morning”) whose position requires diploma/GED, when she was only working there for two days.  Did she look up his position on the employee directory and think, “Oh, he’s a bum.  I will be ignoring him going forward”?  Keep in mind he didn’t corner her with a conversation, but just casually smiled and said “good morning” as he walked by her.  But she just silently gave him an ice-cold glare, making him feel foolish or as if he said something wrong.  Do applicants have this trend where they are prepared to separate themselves from anyone who is “below” them, as they worry about getting hit on by male co-workers with GEDs who perhaps live with their moms and are creepy?