Employers don't know the area they are hiring for?

Earlier today i was asked if i was willing to relocate to Baltimore. For those that don't know, i live in Halethorpe, MD which is in Baltimore County, Which is in Baltimore, MD.

I told them this and then asked if they meant Baltimore city and told them that if they did mean Baltimore city that it was a quick metro ride away.

It's made me wonder if most employers don't know this and have been denying my applications because they think i don't live in the Baltimore Maryland Area.