I once offered my seat on a crowded F Train to a VERY pregnant lady. She glared at me, and said, "Do you think I NEED it???" That was the only time I ever got a reaction like that. Usually, it's an amazed look.
LC
All you dear men who keep chivalry alive..bless you. There are still plenty of us ol' gals who love being a woman and appreciate the gestures and manners and will reward you all with our brightest, sweetest smile, slight nod of the head, and a thank you.
I personally don't think a man should have to give up his seat to an able-bodied woman, but I can't imagine anyone getting put out by a display of courtesy. And it goes without saying that everyone should give up a seat for the elderly or infirm.