Customers usually get to say whatever they want. And, guess what, most companies are usually pretty happy when an irate or upset customer decides to do business with them again.
I'm not sure what company takes the stance that "they don't accept that kind of attitude from their customers" but I'm pretty sure that company won't be around for long.
Like I have mentioned before, my company pays an absurd amount of money to research everyone that considered our services and then bought elsewhere - especially the people that were considered "assassins" which were the people that were so upset with us that they intentionally talk trash and try to bad mouth our business. And yes, we have the highest customer satisfaction index in our industry for our territory. So, I'm pretty sure that the negative jerks that bad mouth companies are pretty dang important for companies to understand how they are screwing up and how to fix their problems.
No company just says goodbye to customers for being jerks. At least none that plan on staying in business for long, because it is customers that pay companies. They can't live without customers.