I'm not talking about those who work with Free Software(as defined by the FSF) or Open Source(as defined by OSI). But talking about someone who never heard about it.

Yes if you limit yourself to that there's a lot. But consider this a collegaue of mine:

What do you consider open source -> I can look at the source and use it for myself - period. Nothing more or less... Similar thing when one mentions Free Software(without a definition) - I can use the software for nothing nothing more nothing less.

But yes if you know the definitions it makes a whole lot of a difference.