They generally don't know much about it. But a DSLR, a P&S digital, and to some extent 35mm SLRs and P&S cameras all look like cameras to them. Most older designs, TLRs, press cameras, medium format rangefinders etc. look either old or, if clearly pretty new, at least quite odd to them. Medium format cameras with grips, eye level finders, motors etc. (my 645 Pro has all three) can easily be confused for modern medium format digital - they might not know the words but they have an idea of "digital pro camera" - or even digital video cameras.
Cameras that look old, whether they are or not, seem to get a nicer welcome.