I asked once...There are ways to say it without being rude. I’ve noticed men often ask “did you cum?”
I would simply say “No”
Rude would be “No hahaha, not even close”
A man could ask: oh why?
And then you can explain what was wrong
She loudly replied: "Of course yes!!! Did you notice?"
Me: "Euh...yes...Euh...cool...."
Never asked again....