The blender.org servers are experiencing a DDoS attack since last weekend

That is completely untrue. You may not like it, plenty of Australians don't especially upper class people, but it is nowhere near as offensive here as it is in America. In America it's a full on slur that is never socially acceptable in any context. Here at worst it's a vulgar way to say something unless it's specifically directed at a woman (if it's directed at a woman in anger it is generally treated the same as Americans treat it), and at best it is actually just a normal thing to say to your friends. "Are you cunts ready or not?" is a very normal thing for working class Australians to say to their friends, same as "This cunts not like that, leave him alone" or "Are you serious cunt? You were gonna eat them all?" or "What are you cunts up to?". It can also be said in a non-endearing way even to people who aren't women, it has a pretty similar word distribution to "mate" (not completely identical, "My cunts and me wanna buy a ticket please" makes zero sense). Mate can be a very offensive word to use in context, or a completely benign word. Cunt is similar, it just has more offensive use cases than mate does.

However, the comment is extremely benign.

The only reason for someone to make a burner account for a benign comment is if its a person defending themselves because no one else will.

I call my friends cunts, they call me cunt, strangers call me cunt. It's vulgar, but vulgar and offensive are two different things.

Equally, we're not going to ban Spanish posters from using their word for "black", are we?

You can perceive it to be sexist, but I'm fairly confident that's a minority opinion.