Even BEFORE C-virus was on my radar back in Nov 2019 my SOP was avoid any and all sick people everywhere.
If you are sick and in a meeting with me it is well know either I'm walking out or that sick person is. No i dont wash my hands then as much as now but no sick people around me was my SOP before this. Its rude to be sick and bear others and i have no issues telling sick person to GTFO!
It's beneficial for the immune system to be exposed to some level of different strains of viruses, bacteria, etc. If one lives in a hermetically sealed bubble their whole life then the common cold might end up killing them.
Obviously I wouldn't suggest one willingly exposes themselves to the CoronaVirus, but separating yourself from anyone with a case of the sniffles as if it's potentially deadly is not just overkill, it's likely detrimental to the immune system in general.