You raise an important issue, Mr. F. As time goes on, more and more JW's will have business relationships with people they consider "apostates." Employers are not allowed to discriminate based on religion, so this situation could create a truly hostile work environment.
The great and mighty GB needs to instruct their members to start acting like grown-ups with so-called apostates. On my last job in an attorney's office, one of the clients was a JW, which I learned from her medical records. I so wanted to tell her that I, an "apostate," was working hard for her, in her best interests. I didn't want to rock the boat and potentially cause problems for my employer, so I kept quiet.
Warning to all JW's: You don't know whether your waitress, dry cleaner, medical provider, store clerk, or anyone else is an "apostate." You may be, unwittingly, being pleasant to "apostates" every day instead of shunning them like you're supposed to. Don't worry. We won't call the elders and turn you in if you come into our place of business and we serve you.
Suggestion for Watchtower article: Ask if any apostates work in any business before you go there and unwittingly speak to them as if you're two adults, not cult slave and enlightened one.