I see your point, but I don’t think making it okay for men to be “feminine-ecofriendly” will work. Maybe on 10% of guys…
Instead, tell them: “Well, I think a strong character doesn’t need to buy a lot of stuff. A real man can face reality without exploiting others, he should be a giver.
What are you, too lazy and weak to walk a little further to throw away the trash? Need your mommy to do it for you?”
I see more of my friends doing it, compared to when I’d ask them kindly.