I agree with you, but to be honest, I've offered to give up my seat on occassion for a girl. Usually it's when they're small, and I think I feel that they'll have a harder time not flinging around the bus on the freeway than me
I've never offered it to a small guy though... probably because society's mores would pwn us both. I'd sound homosexual, and he'd be a pussy for accepting the offer, so it's a lose-lose situation. But don't hate me, I'm just playing by society's rules there