His reasoning? Allotting more street space to cyclists could cause more traffic jams, more idling and more pollution.
This guy is definitely a weirdo / lightning rod, to be sure, but hasn't SF always, always been the epicenter of this kind of highly-charged local politics? Critical Mass originated in San Francisco in 1992.
This political contentiousness is nothing new. I remember 10 or 12 years ago seeing sidewalk stencils in the parks at Haight-Ashbury with pictures of cars described as "heat death machines". Here's another article on sidewalk stencil art in SF. You can see a nice collection of stencil art over at StencilArchive. (The bike stencil above came from there.) I searched, but I couldn't find my "death machine".