Fairly certain this is humor. Mainstream feminists just want equality. So they don't want men to fart less, they just want there to not be social stigma when women do it.
I think this is poorly articulated but I do understand this. You have to understand that normal bodily functions were often seen as 'unladylike' and if you were 'guilty' of such then as a woman you were looked upon in a very negative way. For example my grandma said that ladies do not sweat...they glow. Being in a position to fart (as a child I was not even allowed to use that word), sweat or burp men are more free. Continuing the notion that these natural behaviours are immoral for women does already place us at a disadvantage. As my 20 year old lad says, 'wow its crap being a woman'. This in turn perpetuates the inequality.
I also think there is a slight cultural difference here as certainly class plays a part in this. Something that perhaps does not affect Americans and Australians as much as it does for Brits.
That is A Single Feminist.
Kindly do not label every Feminist because one has gone off her nutter.
Regards - the rest of the Feminists - who know people fart.