*Snap Snap*
One of the worst things you can do at a restaurant is snap your fingers at the servers. We blame TV and movies for teaching this sort of behavior is normal. Anyway, this one rude guest was snapping their fingers at the OP, trying to get their attention.
The OP just turned in their direction and laughed loudly at them. The rude table didn’t tip them, but the other table who witnessed the event more than made up for it with a generous tip. You see, Karens? The entire world is against you guys, and we love it!