AIBU to have considered a comment as intended to be sarcastic?

[lolaflores]

At a day out with the family. We were sat on benches watching a horse type event. People sat beside us. After 20 minutes myself, DD and DH got up to go and look at some other things.
Lady to my right says quite loudly "Was it something we said?" as we passed.
I stopped, asked "Excuse me?"
She turned and laughed to her friend and repeated it then blushed a bit, flustered, I said no more and simply walked on followed by sniggers.
She was a woman in her 60s.
My husband didn't seem to think this was rude...at all. Something to be expected from people of that age group.
I found myself a bit non plussed as to why anyon would make such a sarcastic comment FOR NO APPARENT REASON other than to embarrass.
Am still confused by it.
Also, I didn't dig her in the chops like I wanted to.

Touche!

I'm in my 50s & I/ve heard it but in my wisdom never used it.

There are some sayings that just don't get carried down the generations!

Bit unfair to the OP when she wasn't the one who passed any comment on 'that' age group.

I wonder if OP is from the South/big city and commenting lady was more Northern or rural. In my experience city/southern people get a bit flustered when strangers interact with them unprompted whereas it's much more common the further North or into the country you go. My Scottish Mum was a great one for trying to strike up chats with people on the Tube and in London shops when she came to visit me, usually prefaced by some sort of random quip like the OP experienced. They'd generally look horrified.

Conversely, whenever I went home it took me a while to readjust to all the chattiness at shop checkouts, bus stops etc.

I'm from London and often strike up conversations with strangers JessieMcJessie. I love to give tourists directions. In fact I love it so much I often approach anyone who is puzzling over a map. I'm sure some of them think it's a distraction technique and my mugging accomplice is waiting round the corner.

Jessie you are maybe right. I totally do this. And am a Scottish mum (not The one =

Sorry.. Hideous typing on bus.

That's someting I'd probably say just to make friendly conversation. I'm sure things I've said have been misconstued sometimes but most people are receptive to a bit of friendly banter. Oh well, I'm not going to stop doing it, life would be boring without it.

I am nearly 50. Have heard this phrase used before. The woman who said it was southern and not trying to be friendly as I had sat beside her for 20 minutes. She commented as I stood up to leave.
I am Irish and have no problem whatever engaging in an impromptu chat with anyone I encounter as does my mother, who would not in her wildest dreams make a joke like "Was it something we said" to a passing stranger.
I was taken aback by the seemingly randomness of the comment. I might say that to someone I knew, not a person I had not even passed the time of day with. If I had been having a chat, then I would have not minded in the least. She just piped up as I passed her.
On my own side, I have recently had to start using a walking stick, was anxious in a growing crowd and felt self conscious enough wobbling down the steps without the commentary.

I think it's tiresome and rather impolite. I don't see what's wrong with your response to it at all. I'd probably roll my eyes and not say anything but I would be thinking rude things.

Yes, it was just a harmless comment intended to be mildly funny/friendly.

Assuming they'd been sitting there quietly enough watching the event too, an appropriate response would have been something like "yes, it's all that raucous swearing and dancing on benches, ha ha".

You misread her intention OP, it happens, move on and forget all about it.