Is it rude not to give up your bus seat to parents with young kids?

I generally don't give up my seat to just anyone, but I would if they were disabled, because being disabled isn't something a person can control. But I don't give my seat to elderly people; I used to, but I never do anymore. I also don't give my seat to mothers with young children. Because yesterday, mothers with children boarded the bus, and each of them had at least three young children. Also, senior citizens can ride the bus for free, so there are elderly people who take the bus even just to buy bread. I don't have sex, but poor people have children. If they don't know how to buy a car, they shouldn't have children either.

Is it rude not to give up your bus seat to parents with young kids?
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