I wondered if there is a protocol for handling the bad restaurant experience. A number of posts have mentioned experiences with poor service, off-portions, off-preparation. While it's easy to express dissatisfaction when in familiar company that shares your sensibilities, I'm not sure how to handle the bad restaurant experience in other circumstances, such as when you are with a group of unfamiliar guests. Don't want to come across as a complainer or put a negative vibe on dinner that some seem to enjoy. A recent bad experience led me to e-mail a somewhat trendy popular Seattle restaurant later that evening. Felt a bit awkward, but I figured they would want to know.