I do drive this way, most often in Seattle which has no shortage of the behaviors you're referencing. You can drive safely too because you are in control of your vehicle.

I didn't always drive like this, but I was in an accident that was my fault that totally upended my life, so I made an effort to change my ways. You can do it too, before you get in an accident that sets your life back, or irreparably shatters it...

I recommend taking an advanced drivers education course if you seriously decide you want to improve your driving. A lot of this stuff is covered.