[fit2rule]

At the base of typecasting/stereotyping is prejudice. If you prejudge someone as being 'a manager type' before they've done any actual, you know, management - then you are prejudicial in your approach. Just because someone doesn't wear a tie and conform to social normatives, does not mean they cannot do things "typically associated with" socially-constructed norms, or 'types'. This is the biggest problem with manager-culture today: that bigotry and prejudice is still very much a factor in human interaction.