By working class if you want to say, workers, little employee, postamen, taxi drivers.... Yes I guess most of them are stupid (or lazy) people. It is not treating them with no respect by telling the truth about their brain fonctions.
I was staying out of this whole thing and just sitting back reading it, but then I saw this and I have to say, this is a pretty offensive statement. Who is to say that just because someone chooses a career that isnt doctor, lawyer, etc that they are stupid. What is stupid is that statement. And I don't know what you mean by "little employee" but in many corporations, and in many businesses in general, the "little employees" are some of the most important ones, because without them nothing would happen. Would Brioni (or Boss) be able to make their suits without the "little employees"? I think not, and just because they chose that job does not make them stupid. Some of the most intelligent people I know were working class people who, for whatever reason, happened to like manual labor and became farmers, or delivery men, or post office employees. So just becuase you think you are better than working class people DOES NOT make them stupid.