No one said it was. You might as well complain about the respective pronunciations of arse and ass, or Aluminium and Aluminum, or the spellings of surprise and surprize. Zebra is pronounced zeh-brah here, not zee-brah. The letter Z is spoken "Zed".
Then you get whole words that are different. Your jelly is exclusively jam in Britain, whilst jello is called jelly. Cookies are usually biscuits, which is American for scone. Rock, stone, pebble, boulder, in America all but rock are rarely used for the individual object. Soccer is football, football is American football, Imperial measurements are frequently ridiculed by the youngest generation, fries are chips, chips are crisps, jawbeakers are gobstoppers, capularies are capiliaries...
The list is endless.
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