As is well known, some of the popular frum singers have made albums that include a song “shelo asani goy”. Very nice. But why have none of them included a song shelo asani isha?
Why make a song which only applies to half of the population when you can make one which applies to everyone?
If you were truly curious, rather than trying to offend, you would have asked about שלא עשני עבד as well.