Imagine if we flipped the tables. If it's all on women to have and raise kids and nothing more, wouldn't that mean a man's job is to get laid/donate sperm, impregnate someone once, and that's it? If that's all there is and he's fulfilled his role, there's no need to stay alive after that. Like a male bee, exploding after mating. Why bother with society, hobbies, learning and growing? OP's "job" as a man is nothing more than to literally fuck off and die, mission complete.

Obviously I don't believe that, just taking his argument to its logical conclusion. I've heard people say that women are just for making babies so many times in my life, but I've never heard men's role put in the same terms.

It sounds ridiculous because it is ridiculous. We're all so much more than our biological equipment. I know I'm preaching to the choir here, I just had to rant for a moment.