I guess one could also argue that allowing somebody to access your website is similar to choosing who you allow to enter your own property. If an individual chose to allow only black people into their house then that wouldn't be illegal so why would it be different to not allow somebody to access your website?
A webpage is generally considered a public business if commerce is involved. The rights of public ingress, egress and regress are different than the rights of private ingress, egress and regress. You can not say that blacks, Asians, or speed bumps are not allowed to enter into your place of business, you can say that they are not allowed into your private home.
While I hesitate to mention the fact that some clearly illegal activities occur on the internet, *rolls eyes*, it is possible that a dating site counts as a private club. Or, they may provide access to pigmented Americans but require themselves to be identified as such.
Edited by coltom, 02 July 2012 - 12:57 PM.