Is it time to start calling out bad cyclists?

OK so. What gives him the ride to have a go at me?
Is he
a. My wife?
b. A member of my family?
c. A friend?
d. My boss?
e. The police?

I know he is not a or b and I don't think he is c and I know he's not my boss so I was asking him the question. What right does he have to tell me what to do if I am not interfering with him as an individual and am not part of some collective group that I chose not to represent?

More general question - why does someone have to know you in order to have an opinion (albeit a negative one) on your behaviour? Given that we're all judging each other all the time, is it voicing the opinion that's the issue, or should we all try harder to ignore the behaviour of people we don't know?

Kind of makes me think about the shouty folk on Jeremy Kyle shouting "You don't know me, so don't judge me!"

I don't need to know you to think you're a fool, love.