Courts have upheld that privately owned shopping malls are "Public Commons" where people have free speech rights no matter what the policies of the owners of the shopping malls. Web-sites such as CafePress, it could be argued, by allowing in the public, are Public Commons and as such don't have the right to limit anyone's free speech which includes, but not limited to, setting up a section named "Cafepress is a left-wing nutjob."
While the very concept of "Public Commons" is a purely leftist idea used by the Left to survive by parasitizing on capitalism through injecting communist propagandistic larvae into the host bodies of wealth-creating capitalists (which I guess has unfortunately happened to Cafepress at some point), I consider it a fair game to invoke this concept while fighting the Leftist infection itself.
While the "Cafepress is a left-wing nutjob" site merchandise is still banished into ether, PC’s "Che™ is dead" shirts have miraculously been restored! Now, if they only sold coffee cups...
Via relapsed catholic