Well honestly I can't really bring myself to care about it. After all, it's not like we're going into the SerenityOS Discord and seeing Nazis. It's a very slight rebellion, and seems to serve well to defuse tension and actually create a space with less hate than a lot of the spaces which do enforce more modern ethical views.
I just find it sad, more than anything. SerenityOS and Ladybird are interesting projects which I wish I could respect. But instead they seem insistent on regressing back to a dark age in tech where casual sexism was (even more?) commonplace. I can't respect that.
Calling this regressing to a dark age might be why some people choose not to care about such things. Her picture is already everywhere anyway and there's nothing offensive or disrespectful about it.