Because I'm too lazy to hit the about button and find out its an all female site (which it is), one english language gendered pronoun has one less letter than the other and I'm lazy, in this particular situation scattering some "s" doesn't change the content of the discussion in any productive way, and gendered pronouns as a concept is a fairly stupid language design decision and one way to demonstrate disrespect for a stupid idea is to ignore a stupid idea's ridiculous rules.

If our shared language was poorly designed enough to have racially segregated pronouns as opposed to gender segregated pronouns (don't laugh, its an almost equally stupid design decision) I'd probably call you all martians out of disrespect to a dumb design decision not because you're all actually from mars.

Its not because the website authors profile pics make them look manlier than myself or I admire their beards or anything dumb like that.

TLDR: Doesn't mean much.