The next time a random person reckons that you're being rude, tell them you have Tourette syndrome and end the sentence with Wanker.
Discussion
When I forget people's names (cause I'm bad with names or I just don't care for them) I just introduce myself like we've never met. They say "oh we met at this event last year, you don't remember?" I say "Oh no, I'm sorry, my memory has gotten worse since the accident." Now they're the jerk.