In fairness OP did say has a feel of not 'is the same as', which I read as suggesting this is the thin end of a wedge where a group comments on women's normal human behaviour (eating) in a way that they do not do to men. Give 'em an inch and they'll take a mile sort of thing.
To me (daily tube commuter) it is an odd thing to point out, let alone take a picture of - lots of people eat on the tube amongst other activities. London seems to move at a different pace to everywhere else I've lived and so normal activities (eating, getting ready, watching TV, sleeping etc) happen at unusual times and in some cases spill over into tube-time. Because of that I suspect fetishism here rather than bullying.
I'd be narked if anyone took a photo of me and stuck it on a Facebook group page for any reason though.