Novak Djokovic: 10 Reasons He's Better Than Rafael Nadal and Roger Federer
I have no idea who either of them are, who are they?
Either means 'both', 'one' and neither means 'not either', 'none'. Either is used in negative constructions, while neither
and no answer is considered to be rude and impolite, answering in another way is rude.
Yeah it is rude to just stay silent. However, it is not rude to verbally decline to answer, change the subject, explain if the question makes you uncomfortable or any number of things that don't include answering
it is also rude to pretend that you are better then someone on an online conversation task. explain how you are not following the protocol of this hit 
How to Talk to Your Team When the Future Is Uncertain
how to talk to a person and have an engaging topic when the other person is being un-engaging
one time work long time
You literally make no sense here