I was a regular car slapper when I commuted 3X week ~35miles each way up the coast Hwy through Laguna Beach, Corona Del Mar and Newport Beach. If anyone knows that area, they also know why.
I'd typically ride in the middle of traffic as I was going faster and I stood less chance of door face.
I was in my 20s, hot headed and made weekly contact with cars - normally < 20mph.

I also ended up needed medical work a few times. Once a lady drove into me after a slap. She got in trouble.
I'm blessed I was not killed.