Unfortunately Matthew you can't really decide to take the appropriate action (or not) based on how you're feeling at the time. If you're too tired to cycle responsibly, don't cycle.
When you pass your driving test will the amount of attention and curtacy that you show towards other road users vary with your mood or energy levels? If so then you'll be guilty of the very same poor manners that you often accuse drivers of when you're cycling.
The guy you met on the shared use path is most likely telling a very similar story about a cyclist he came across who was riding on the wrong side of the path and scaring the life out of him with an air-zound!
The net result is that both of you think the other party was totally in the wrong and therefor neither of you are going to modify your riding or learn anything from the encounter.
As others have said - always assume the other guy hasn't seen you, is stone deaf and partially sighted and is having a bad day. If you want to stay safe don't rely on them to take the appropriate action. Better that you both take avoiding action than neither of you

Not intended as a lecture honestly Matthew, just advice from an older (though not necessarily wiser) rider. I hope you choose to take it as such