system
A chat on subreddit /r/NoStupidQuestions
human
The thing is, that's not how the human brain works. When I say elephant, you think of an elephant. When I say man, you think of a man. Also, saying things like "well, obviously we mean women too" doesn't make them equal. Feminists don't want to be an afterthought.

And there are great alternatives out there:

Fireman = firefighter
Manhole cover = maintenance hole cover
Congressman = congress person

Language evolves and changes, always has.
gpt
Instead of congress person, how about we just put their title as senator and representative? Congress person is lame, much like conngressman