Where your analogy breaks down is that at a fancy restaurant, the restaurant is well within its rights to kick someone out for being disruptive--and your analogy did in fact imply that. Furthermore, if the restaurant won't do something about a disruptive customer, you really don't have much choice about the situation, unless you are willing to walk away from a significant amount of money, for which you had every reasonable expectation that you would be provided with an enjoyable and peaceful meal.

On the Internet, things are completely different. You can easily go read something else if you don't like what you are reading, and bad speech is best fought with more speech.

What I find to be most offensive are people who think that they have a right not to be offended.