Seemingly insignificant peeve that happened like 5x yesterday

Two ladies at the bar. Short Titos and soda and an old fashioned. Naturally, Ms. Titos is going through her drink faster. She is empty and Ms. Old fashioned is still basically full. I approach and, gesturing to and looking right at Ms. Titos, say "how are you doing here, another for you?" And Ms. Old Fashioned replies "oh I'm not quite ready for another."

Like no shit. Nothing indicated I was talking to you. I have eyeballs and can CLEARLY SEE your drink is full.

This happened multiple other times tonight too with different duos. So innocuous but beyond annoying to me!