I mean all he said was the girl was attractive, good looking etc?! If I was the girl I'd be flattered to be called attractive.
Seems to be going to far to resign over it. Maybe it was because he said "Put in a good word for her" at the end and this could be seen as doing it BECAUSE he thought she was attractive. Also using the word dusky was suspect
I think the controversy was it turned out he was talking to the work experience girl or something, but he didnt know she was still at school (I think!!!)