It doesn't make a lot of sense to discuss things that are totally subjective and can't be defined with a certain specifity. - What is the definition of rudenes

It doesn't make a lot of sense to discuss things that are totally subjective and can't be defined with a certain specifity. - What is the definition of rudeness? - How can rudeness be quantified and measured? - What did the interviewee perceive as rudeness? - Is the shown behavior correctly observed and classified as rudeness?