I don’t speak English, I speak American.
A boot is for kicking ass, not where I keep the spare tire.
Try this if you have a co-worker who you consider a friend and is also annoyed by it. Start having discussions between yourselves in a totally made up language. Just look at each other and rattle off some Klingon like words and periodically sneek a look at the Spanish speaking guys and then look back at each other and snicker as if you just had a good joke at their expense. Do it just enough to get under their skin like they are doing to you and avoid speaking Klingon when anyone else is around. No one could ever do anything since no one would ever be able to determine what was being said. If they ever ask what language it is have something ready, like Barnoovian, and explaing that both your families are from the Barnoovia valley in southern Mongolian border region and that you were required to learn the dying language as children as required by Baroovian tribal elders as customs and traditions required. Then fart in their direction and tell them that it is consided a high compliment by a Baroovian and wait attentivly after informing that an equal or better reply is expected else it is considered a great insult. If someone trys to lie and say you said something you did not say in order to get you fired or something serious you let the cat out of the bag then and show them to be liars.