From the dak ages of this blog:
Weak Men Are Superweapons
The straw man is a terrible argument nobody really holds, which was only invented so your side had something easy to defeat. The weak man is a terrible argument that only a few unrepresentative people hold, which was only brought to prominence so your side had something easy to defeat.
In the bad old days, you had to build your own strawmen when arguing politics. Now, thanks to the wonders of the Internet, you can just pick one off the cyber-shelf.