No more odd than "farbe" or how it's spelled in any other foreign language. Once you stop insisting that you and the US ought merge two separate languages into one, your frustration level will decrease markedly.
I don't think they should be merged. I think there should be two separate languages. It's silly to change the spellings of words and make up new words whilst continuing to call it English. Your language could be called American.
And there's no frustration - it's just a bit of light hearted banter (do you use that word?!).