Has joining actually been made harder and less pleasant for ~54% of the population? Has joining been made harder and less pleasant for ~54% of the population as a result of that ~54%'s membership in those two demographic groups?

There is no inherent quality of being female that would make one be viscerally repulsed by the use of the term 'sluttiness'. Apophemi cites that as an example of a term the use of which makes joining harder and less pleasant for... well, 55% of the population, as a direct result of their membership in those demographic groups:

If by “sluttiness” r-you mean “sexual promiscuity”, what is gained by using a gender-targeted insult that is likely to make a significant portion (i.e. women and/or queer people, who together are like… 55% of the world at least) of r-your potential audience uncomfortable and less likely to engage with r-your argument?

I hope it's obvious that "women and/or queer people" aren't the operative groups here. I certainly haven't noticed any inherent property of my not being straight that makes me necessarily uncomfortable with the use of the word "sluttiness" and less likely to engage with arguments that use it, and I've heard women use the word in the exact same sense the reactionaries Yvain was arguing against in that post used it.

After rectifying the names, it emerges that the operative group is a political identity -- one that may be (and probably is) more likely to contain a higher percentage of those demographics than the population at large, but one that is neither identical to nor inherent in those demographics.

"I speak for the entirety of this demographic" is a really suspicious thing for a human to say -- triply so when it's about something politically charged.