Benji,
I think these are the knee jerk reactions that are quite the norm the moment a guy makes a negative comment about the physical characteristics of a Fkight Attendant.
First knee jerk reaction to the OP being - who does he think he is, cabin crew aren't there to be gawped at.
There is nothing in his post that talked about the age of the FA, how high her heels were, was she pretty or not. It was purely a size issue and his perception that the FA was a flight risk. The fact that he did make some light hearted remarks to illustrate the size of this person is neither here-nor-there.
Even if he is being overly exaggerated, I think this debate is a necessary one. The service industry requires looks - whether you like it or not.
If it was up to me, all FAs would have to be no older than 40, with a waist line not exceeding 24 inches. 22-23 inches being preferable.
However safety is a number one priority and I would forego my requirements providing they do not pose a safety risk. According to the OP, (who I was not its at Gate 10 at Perth) , the said FA was a flight risk and I agree with him- ground the FA.