I bet you're right, he was trying to pick you up. But it's interesting that he was using the body policing that women suffer every day as an icebreaker. Jerk.
Women in general get the food police, and the body police, and the ... whatever police. What we look like, eat, say ...
In my case, I am a larger woman, and frankly I avoid eating in public because then I am A Fat Woman Eating In Public. Sigh.