I thought it was a bit snobby, actually - the author may as well have called them chavs and said what they were really thinking...
I thought it was horrendously snobby and lathered in lazy unthinking stereotypes.
I think it is completely unhelpful and fail to see what the writer hopes to achieve beyond trumpeting her own superiority.
They are the forgettable men. They move among us, in their pointy leather shoes and shirts from TM Lewin, selling advertising space, or selling properties, but generally selling something, living wholly generic lives.
My response to that opening paragraph is odfod.