The anon user could be used by an advanced alien specie, trying to understand the technology underpinning operating systems in order to launch an attack against the humanity. Thus, the developer is specist against non human entities.

No? Too extreme? Where do we draw the line between leaping to concussion and labeling people? Refusing to change a gendered pronoun to a gender agnostic one isn’t a great look. One can most certainly make an argument that it’s a sexist view of the landscape in favouring male users over others; but no where in the discourse that I could see did they attack transgenders, so it wouldn’t be fair to label the developers as transphobic. I think it’d be prudent to address the issue as they are, not leap to conclusions and apply labels.