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Ah. For the same reason one of my friends hates telling people that he's a dentist when he first meets them.
People often respond "Eww, I hate dentists, lawyers, insurance companies, etc..." Then you have to add a shudder to get the total effect of how loathsome your career choice was.
No doubt admitting you were a mortgage broker or real estate agent will now carry the same sort of stigma in certain parts of the country, though a couple of years ago they were perceived as acceptable jobs.
I don't list all my clients I have done work for in the engineering business for the same reason. I'm not ashamed of them, I just don't feel it necessary to defend every client that I've ever done a project for.