Not wanting to be rude about the woman in this case but..
Being a fat minger she might be a bit less likely to be too careful...
The lad would have though his boat had come in & it was xmas, the 2nd time he would have thought he was onto such a good thing having been there before & not knowing any different.
Maybe he got some stick off of his mates when he told them & they knew who she was.
"?? sh@66ed a fat minger!" type stick..
Perhaps he then got shamed into telling his dad.
"dad, whats wrong with sh@66ing a fat minger?"..