As someone born in the mid-eighties I'd like to say that your statement probably was pretty accurate in the 70s or 80s - but that by the 90s, and especially by

As someone born in the mid-eighties I'd like to say that your statement probably was pretty accurate in the 70s or 80s - but that by the 90s, and especially by the tech bubble, it went fully mainstream. This cultural identity was definitely embraced and promoted by people for selfish reasons, being able to keep people separated and distrustful prevents union formation and social programs... however it was my impression growing up on the east coast that it's the common opinion now. We're not getting this message from Marlboro ads or magazine articles alone - your boss, your coworkers, your friends - a decent number of these folks will reinforce the message.