You're so ugly that when you were born they didn't slap you they slapped your mom.
My psychiatrist told me I was crazy, so I said, "I want a second opinion." He said, "Okay, you're ugly too."
Insult: Hey, you're not much of a looker, but I'll date you.
Response: Thanks. You must be very open-minded. Was that how your brain slipped out?
A guy is sitting at a bar, and a drunk dude walks up to him, calling his mom a whore. The first guy just ignores it and stays in his spot drinking his beer. An hour goes by and the drunk dude comes back saying, "Your mom is a whore!" The first guy looks around the bar, sees people staring and says, "Don't worry, everything is cool here," and shrugs it off. After a few more shots, the drunk dude walks up a third time and says, "Your mom... is such... a whore!" The guy finally gets mad, throws his fist on the table and says, "You know what, Dad? Go home!"
You should do some soul-searching. Maybe you'll find one.