Living in DTLA I had more shitty situations happen, non bike related (see lapd hate thread). Riding in Orange County I've had way more problems.
I was relatively beaten on the porch of my house on late evening after riding my bmx several years ago.
On my way home from a late night riding session in my city a shady looking SUV followed me and some friends on our way home. I got the hint and pedaled my ass off to my house. The car raced ahead of me and 4 guys got out of the vehicle with baseball bats. I managed to ride up to my front door, but it was locked and I would have had to fumble with my keys. I turned around as they were on my heels and defended myself with my bicycle for a brief moment as they swung away. I received several blows with the bats before someone opened the front door and scared them off. I received several welts from the bats and a couple swings to the head.
Definitely shitty situations around here.