If that comment is anything from which to judge, it probably wasn't the bad joke, it's more likely that she realised that your grammar wasn't that hot , either!
"Last week, a beggar approached me..."
Last week a beggar approached me...
"...approached me outside 7/11..."
...approached me outside 7-11
"She said, 'you you money me'".
She said, 'You, you, money me'.
Well, you started the "grammar" bit!