You're using the wrong definition for man to qualify your visual irritant. Man in this case means "human, person". If I say this will help all mankind, I'm not excluding a gender. You simply misunderstood.
Besides, women programmers are often quickly promoted, so yes there's only men left at the bottom level.
Full time employee hours.
https://www.google.co.uk/search?q=%22fte+hours%22&rlz=1CDGOY...
That's what the "equivalent" part means.
However, it's true that criticizing man hours is not understanding language or etymology.
We could go on with things like cowboy and cowgirl. Why do we call adults boys and girls? On the other hand, they are just terms. Just like husband really isn't interpreted as "house bound". Bound, tied to a house, i.e. not free.
But... people being people we see others getting in trouble when son misunderstand etymology and meaning like when people use synonyms for frugality and people find offense. There will doubtlessly be other words which fall into disfavor for looking or sounding too much like a scoundrel word.
I just wanted to point out that said debate would hinge on more than a narrowly semantic question about the meaning of "man".