GASP!! I have stumped Kitura!!
I was going to give you another hint (the line was spoken by Carey Grant), but to keep things moving I'll just give you the answer. It's "Arsenic and Old Lace."
Okay, I'll try again:
"Oh, *I* have sarcasm? When every word that comes out of your mouth is dripping with disdain?"
"Ah! But that is because I am a miserable, grumpy elitist - and that works for me!"