*This one requires a disclaimer. I am going against my own advance and will be making sweeping generalizations in this post. Please do not bother to comment about how the British person(s) you know does not do A, B, C or D.
1. British Newsreaders Pronounce Barack (as in Obama) Bear-ick. What is this about!? Its a man's name, you cannot decide on your own pronunciation for it or blame it on dialect or accent. There is only one correct pronunciation and it is Bah-rock. C'mon BBC - get it right.
2. "Cutesy" nicknames and shortening of words. I think its mostly British women who are guilty of this one as luckily, I have never heard my husband or any of his male friends do it, but I seem to hear women say do this all the time. Examples include: "piccy" (picture or photo), "footie" (football), "pressie" (present) and "brekkie" (breakfast). And these are grown people saying these words to other grown people.
3. The relationship with the average British person and sunshine. Refer to my post on 4 October for a full discussion on this topic.
4. I hate (and yes, I know its a strong word) when British people return from vacation/holiday in Florida or California (since those seem to be vacation destinations of choice) and think they are an expert on American culture. They come back spouting nonsense about things that Americans do and what its like in America not realizing there is an entire country in the middle of the two coasts that are NOTHING like the vacation superspots they may have visited. Sorry, folks, but you have not seen America if you have just spent a week in Disneyworld.
Tea creates hostility, although you can you see from the photo on the right, some people disagree...