When I'm at work, clients usually take priority. If they call me cellphone while I'm talking to a coworker I'll usually answer it, just as I would if they were calling me on the office phone. There are exceptions of course but in general that is how it works.
I don't know why it bothers people in retail. If you are ordering at a counter then it interferes with what you are doing but if you are at a store checking out it isn't as if you'd be having some deep conversation with the person. I spend time in retail and food service and it never bothered me.
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