We all have to deal with curious customers. Most of the time it doesn't bother me.
I worked Industrial Maintenance for several years,when there was a break-down,
there would be 1 to a dozen supervisors standing around looking over our shoulders asking questions. This was good conditioning for me. Because I learned to tune them out,when Iwas in a situation that required my full attention. I enjoy talking with my customers answering their questions. But if I am in a situation that requires my full attention. I tend to tune them out. I will explain that I don't mean to be rude but i am having to give my work full attention. Most understand.