For most of the rest of us, "free software" and "open source"
are synonymous. RMS didn't like the term "open source"
because it is too "neutral" and not radical enough for his taste.

It's a tempest in a teapot. He's just being hysterical.

http://www.catb.org/%7Eesr/Licensing%2DHOWTO.html#FAQs