Why would a guy address you by saying “my dear”?

Why would guys who are strangers call me “my dear?” They tend to be guys around my age. Each time this has happened, they were guys who were helping me with something (checking in at hospital, ordering food). I find it interesting that guys call me that and they’re not saying it in a teasing/flirty tone and aren’t elderly. Don’t get me wrong, I do find it sweet; I just want to know what others may think!
Why would a guy address you by saying “my dear”?
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