Want to get your message across when you have been wronged as a customer? A strongly worded letter may work. Better yet, give the offending establishment a call and offer them direct feedback.
And if you are on the receiving end of that feedback, take it to heart.
Unless, of course, the feedback is from an angry patron, and their anger is a response to you doing something that delights the rest of your customers. In that case, you can use it as a means to let your clientele know you are transparent in your dealings, and that you stand by your policies. (Fair warning, a bit NSFW of language follows.)
Someday, I will visit the Alamo Drafthouse. And I will nod approvingly.