what to people in london consider insulting?

They are basically the same as Americans except they have a humorous accent. They really like it when you make note of their accent.

Also, the British are far more outgoing than their American counterparts, so feel free to whip your penis out and slap women and children with it. You may have heard that in certain European countries that people will traditionally kiss eachother on the cheek as a greeting, this is the United Kingdom's version of it.

the thing that english people dislike the most about americans is that they talk louder than everyone else......they also talk too much about what it is like to be an american. if you want to make friends with british people, allow them the opportunity to talk as well.