Tbh I find it more disgusting when someone doesn't eat... but apparently, this exact mentality has made it far enough that some women will not eat on a date with a potential partner because that would lower their chances. I mean, the whole "Imma powder my nose" euphemism is basically the reaction to men not wanting to accept women as human beings. But not eating is certainly another step in the same (wrong!) direction.
In my opinion, if you have a problem with a woman when she's on her period and having diarrhea at the same time you're not ready to be with a woman and should buy a blow-up doll instead.