10. Constant interruptions
Some people just love to talk. They love to talk so much that they cannot let anyone else finish a sentence, or watch a movie in peace. When you are trying to say something and someone else cuts in all of the time, it gets annoying very quickly.
If you interrupt someone in mid-sentence, you might as well tell them to shut up because what you have to say is more interesting. When you talk during a movie, you stop other viewers from being able to relax and enjoy it. Is what you have to say really so important that it is worth annoying others and giving the impression that you are thoroughly rude