Are there laws on the books agreed to by the citizenry to protect KKK members from discrimination or even defines them as a class? Why do you bring up ridiculous hypotheticals when the bottom line is that the community itself agreed to impose those laws and they are what they are unless a higher court strikes them down, which hasn't happened anywhere?
If you don't like it, you have four options:
1. Petition the city to change the laws
2. Get a higher court to strike it down
3. Live with the new law
4. Move
No court has struck down these laws. At best, defined the limits. So that leaves you with, 1,3, or 4. 1 will likely never work because the city passed the law with public support. So you live with it or move.
One thing that I find ironic about this is that republicans perpetually talk about wanting a weaker federal government but as soon as something is passed locally that they don't like they ratchet it up federally. A lot of playing both sides of the issue on that one.