Yes Iv'e had that argument myself a couple of times. From what I understand the Germans changed the official designation from Bf to Me with the introduction of the E-series however LW reports still occasionally used Bf up into the end of the war hence the confusion. The British in particular seem insistent on using Bf for all models.
I follow the "first Me is the 210" line. Aircraft designations didn't change with series is my creed.