It might've worked in your favor this time not to have actually shared your riding experience with him: he might've well just dragged you out of your car and beated you for actually knowing better
On a more serious note, from a learning standpoint, did you finally see the rider at some point (i.e. after the fact) prior to stopping [and getting chewed out]? Whether you did or not, do you think you would've seen him if he was wearing a high visibility jacket?
At no point did I see him.
My first inkling that I had cut him off at all was the sound of the (typically weak) stock bike horn and his tires chirping behind me as he grabbed his brakes after I had already made the turn.
This was a wide boulevard which provided a good, long line of sight. He must have been really booking it and I simply did not look far enough up the road to notice his approach.
Once I knew I had cut him off and he was behind me, I made a conscious effort NOT to brake at all (as some people will do when reacting to a situation like that) so as not to compound the problems I had already caused him. I waited until he came up beside me to slow and roll down the window.
I doubt very much that a high-viz jacket or vest would have made any difference at all. I wouldn't have been able to see much of it behind his large full stock Harley fairing anyway. His bike was bright metallic purple with a working headlight and if that didn't register from a distance I doubt a little high-viz material would have been noticed either.
I've always been skeptical about reports that say that a car driver's brain often does not register something as small as a bike when they're expecting to see cars, coupled with the tendency to scan approaching traffic too quickly before committing to a turn, that results in accidents. Not anymore.
I now know that when you're in a city traffic situation like that, your own mind and your own assumptions are your own worst enemy.
I EXPECTED to see cars coming and I EXPECTED to see them traveling at 30-35mph at that intersection because I was in a congested city traffic situation. When I saw neither of those inputs my brain and reflexes processed that into thinking that it was safe for me to proceed. Once your mind has convinced you the way is "clear", it may even subsequently interfere with your ability to spot a small moving object approaching at a high rate of speed or anything that doesn't closely fit the parameters of what you are EXPECTING to be there.
This is probably the most disturbing take-away from this situation for me. That I could make such a mistake when as a rider I have been exposed to and am aware that such things are possible, much more than your average automobile driver would be, yet I still reacted in an almost textbook fashion that could have easily caused injury or death to a fellow rider.