Believe me, when I am "attempting to educate" a less then courteous driver I am very aware of where I am and what my options are.
I have had people follow me before. I handle it in one of two ways depending on my mood and the situation.
I either leave them in the dust or I pull over somewhere and see how bad they really want to talk about it. Never escalated past a little verbal sparring, yet.
I guess I picture my inexperienced wife out there and how things might have gone if it were her or some other inexperienced rider that had to deal with the a-hole.
I feel obligated.