As we know, the term "chivalry" comes from the French "Chevalier" that is to say, horseman or horse soldier, to which we amply give the name of 'knight'

It's quite common in our day to admire this trait but it doesn't really make itself clear and its ambiguity leads to high expectations because at what point does one become unchivalrous?

Is it unchivalrous to ignore a mother-in-law's call?

Is it unchivalrous to call the police when a robber breaks in your home rather than fight him?

Is it unchivalrous to let a woman drive while you sit on the passenger seat looking at Reddit posts?

Is it unchivalrous to pay your landlord half the sum while the woman pays the other half?

What is unchivalrous? How do we measure such a thing?