Agreed. I also think it could be a person’s environment that makes them that way. Mabey they have never been arrogant before but socializing with a certain group of friends at school, or the office atmosphere is what has rubbed off on the guy. If this is the case, they usually do not even realize it because they are still humble people deep down.
I have experience with this after moving to one of America’s “snobbiest”/“arrogant” cities (It really does have this stereotype..im not making it up). You come across a lot of arrogant individuals here… and it has nothing to do with how educated they are because they can only be WORKING on their bachelors… or have a combined D.M.D/MBA. This arrogancy could be stemmed from their background…the way they were raised. Or it could be a recent thing resulting from the atmosphere.
BUT - despite this, this does not mean that EVERY guy I come across in this city (and girls for this matter) are arrogant… there are plenty of down-to-earth guys I have met that have defied this city’s stereotype who are incredibly educated, wealthy, and have power. 
I met my fiance here as well afterall.
It is never good to group people and say that they are arrogant just because of who they are. There are usually other reasons behind it.