To be fair mate you dont sound like the most level headed driver yourself judging by all that
Probably not the most patient when people are just not paying attention. But i am courteous and attentive to other drivers needs.
I don't slam on then indicate at the last minute. I'm quite prepared to miss my turning and turn round further up the road for example. I look further up the road to anticipate problems, and i'm always willing to give way to others.
If i'm in a long line of flowing traffic and somebody has pulled the middle of the road to join i always drop back a bit and flash them in.
BTW, i've never had an accident in 33 years of driving. Mainly because i pay attention and expect bad driving.
I have a clean license because i don't speed everywhere i go and don't try and beat lights.
But i will fight fire with fire when others don't want to do the same.