Because we are all different, there is a good chance that we are all annoying to somebody. There are annoying habits (like blowing your nose in the shower and leaving it for someone else to clean up) and then there are annoying people (who don't alter their behavior so that other people are comfotable around them). We all have the ability to be annoying and we all have the ability to manage our own behavior. We all also have the ability to understand that others don't always do things our way.
In high school, my son had an annoying habit. When his alarm clock buzzed, he slept right through it and let it buzz. My room was next to his and he would hit the snooze button when I banged on the wall. Ten minutes later it would start all over again. And again, ten minutes after that and again ten minutes after that, etc, etc, etc. Buzzing, banging, quiet, buzzing, banging........He grew up and moved out years ago. I tell this story with affection because I actually miss that annoying habit (and my son living at home).
A lot of the stuff from this show and the message boards is really about annoying habits.
Annoying people don't pay attention to the people around them and how they are reacting. It is pretty easy to read the room and see who is having fun and who is not. I think it is rude and even mean to push people out of their comfort zones, especially in a crowd. Just about any kind of behavior is acceptable (non abusive, of course) with the right company but some people just don't like it. I have do not have a personal problem with swearing or off color jokes but don't find it acceptable in front of my parents, any children or in the workplace. The same with personal issues. Keep the conversation away from a crowd.
But.....life doesn't always work the way we want it to and sometimes people ARE annoying. It comes with the territory of living so get over it and TRY TRY TRY not to be anoying yourself!