Rude People and how I deal with it

So, I was in Costco, waiting in line at the service counter and someone tries to cut in front of me.
I said: "Hey, we are in line for this counter"
She said: "Well I didn't notice. It's supposed to be 6 feet apart, not 600 feet"

And in my head I'm thinking - well gosh it's actually about 7 feet distance between me and the next person, which is 593 feet less than this person just suggested. A very big exaggeration. But ok.

What I did say: (blank)
I didn't say anything, I just ignored her. My fiancee stared her down, he told me later. However, I choose ignoring rather than engaging most of the time.

If it was online, I think my approach is similar. If a response is required, I would answer only factual, not exaggerated questions or comments. I would ignore the rudeness, and answer as politely as possible. I think that reacting to anything is a waste of time. I'm not a saint. I used to react to everything, until I read something that helped me see things differently. Life has been a lot easier since I learned this.

Anyone have similar rude people stories that just want to vent it?

:) :) :)