Man that truly truly sucks, but don't let it dampen your riding enjoyment; just spray em, hit em, kick em in the balls (shoot em if ya have to) and keep on riding. Stay safe and stay aware.
Since I started commuting more I recently picked up one of these. Retracts into a small pouch that will connect to my handlebars.
I may also pick up some pepper spray just in case; I also have a CCW permit.