You've got it mixed up, you're only supposed to deploy that snark when someone complains about a private company violating First Amendment rights.
Seriously now, I think its very important to consider how the increasing concentrated private ownership of public communication affects the people's natural rights of free expression. The legal regime that was developed to protect free expression when there was only one entity (the government) with the concentrated power to widely censor may no longer be adequate for the modern world.