If the sign read "I am a proud gay man" I bet the ACLU would pick up the case! This is a crock. Yeah, he probably broke ordinances, but the reality is, the content is what made the ACLU say "uhuh, we can't do anything." If the content was Islam, Hindu, gay, transvestite, Greenpeace, etc. the ACLU would gladly take this case.
Like Bill Oreilly said, the ACLU has gone left and they don't plan on coming back.