what you say is what you are
Flawed response to any insult. The planned exchange runs thusly:
Kid A: You're a gay.
Kid B: What you say is what you are.
Kid A: Touché! I am confounded.

One problem is the literal interpretation... leading to this improbable exchange:

Kid A: You're a gay.
Kid B: What you say is what you are.
Kid A: What, I'm a you're a gay?

The more fundamental problem is that you're allowing the other person to say "Oh, in that case, fantastic sexy stud man train driver". Imperfect and to be avoided.
written by Jo* Bly*h, approved by Phil