It's really not the grapes per se. It's the fact that he asked. That line of demarcation was breached.

I've learned to be polite, and nothing more.

Some years ago we had a Croatian painter in our house. At one stage we were talking and he just picked me up, and put me back down again. I was beside myself.

Some time later he was had up in court for sexually molesting a customer,.

So now, I have firm lines drawn.