Keste is falling victim to this sort of name abuse as well. Keste has mostly heard, Kesty. His name is really just pronounced, Kest (the last e is silent).
I don't get too upset by the name calling. I realize foreign names can be difficult at times. I'm sure I've misspoke many times myself. So long as I realize they are speaking to me I typically just shrug it off and respond to whatever they decide to call me. This is not an excuse to call me nasty names and expect me to respond! *smiles*