It’s a one-time error the maintainer made 3 years ago (at a time when much of the US-influenced west was going crazy with polarization over the use of pronouns), not a consistent behavior of intolerance as one would expect given the level of hostility towards the project seen here. I personally find it weirder to hold such a long-standing grudge for a one-off error, and over a project one is not even personally involved with.

it’s not a meme unless it goes viral.

If you want to be pedantic, it’d be good to know that that’s not what a meme is. A meme is a unit of cultural information—analogous to a gene being a unit of genetic information. A meme may not go viral, just like a gene might not be successfully copied onto other generations, but it’s still a meme nonetheless :)