Review sites like Trip Advisor allow names, but they say that personal insults are not tolerated. I generally feel the same and won't retweet or otherwise promote comments of a personal nature.
In fact, it's no secret that I hope to highlight positive customer experiences as often as or more frequently than bad ones. I encourage people to name names and tell bosses and talk about the fact that friendly, polite, professional, genuine, customer-oriented folks do indeed exist in the customer service industry. And I pass it on. Why should the opposite message be censored?
If you think it's out of line to comment in detail (including names) on bad customer service, feel free to leave a comment here or continue the conversation on twitter.