A lot of American changes are unecessary, but one thing they've got spot on is the word 'practice', as well as licence and words of that ilk. In England, we use -ice for the noun and -ise for the verb (Example: If you don't practise dentistry, you'll never get your own practice.) which is needlessly confusing. In America they just use -ice for both, which is much more sensible.

On the other hand, we're definitely on the right side of the -ise/-ize debate, since our suffixes are at least consistent throughout the language, unlike American English, which retains a number of -ise words while supposedly advocating the use of -ize. So we're right to chastise you for that one.

As for the big color/colour debate, I suppose it's a matter of personal preference. Although I don't understand the argument that 'color' eliminates unecessary letters. English is full of unecessary letters, and that's all part of its charm. Either start saying 'l8r' or leave our 'u's alone, thanks.