An old, wise professor used to tell us "remember that half the people are below average"
to that I would add, remember that 1 percent of people are nuts... and some of them drive.
Yes, and the rest are on bicycles.
If there were drivers who reacted aggressively toward bicyclists because of their tee shirts wore we probably would have heard of specific incidents by now, either as BF posts or as news items.
Not my political affiliation certainly, but I like the looks of this one:
http://www.zazzle.com/communist_bike...88241541859828