Why does San Diego have some of the worst drivers?

I've lived in Seattle, Minneapolis, Florida, Fresno, and since I moved to San Diego a few years back I have seen some of the worst driving ever:

1. When a lane ends and it's merging, the drivers here wait until the very last second and force their way into traffic, vice finding an opening BEFORE the lane ends and signaling your way in so everyone behind you doesn't have to tap the brakes.

2. Drivers cut across mulitple lanes of traffic to cut in front of others and take an exit at the last second, vice waiting in the exit lane like everyone else was.

3. Oh here's one...you're waiting to turn right onto a major road. There is oncoming traffic so you wait...only to find out the car approaching was going to turn right all along, but not courteous enough to use his blinker.

4. Oh and the doozy...it's rush hour, slow and go traffic, and you have these boneheads that keep changing lanes all over the place thinking this will get them to their destination faster...all it does is make everyone behind them tap their brakes and cause a huge domino effect.

5. You're at the store, and you're backing out of your parking spot. But everyone keeps driving right on by like they are a runaway locomotive and no common courtesy to let you back out.

6. You go to pass a car ahead of you. So they see you going to pass, so they speed up to block you.

SoCal drivers in general are all about offensive driving that benefits them and not defensive driving that makes the road safe for everyone. Maybe some of it has to do with the mexican drivers that come up here with their bad driving habits and it rubs off on others....I dunno...