WTP
Nobody has a problem with the three letters MAN. This is a strawman. (oops, starwperson). The discussion is over the word MAN when it excludes females. As in Fireman, Policeman etc.
If you look up the etymology of the words you list, none of them (to my knowledge) have anything to do with male/female. much like adaMANt, and MANnage dont.
On the other hand the word “mankind” is based on the word Man as in male. Now whether it bothers you that the “default” or main gender is the male gender is a separate issue. It seems not to, and perhaps it is silly to be bothered that Males are the dominant gender.
But is is sillier to misconstrue the discussion as being against the 3 letters MAN