[JerryG]

What do you do when someone plays up your back ?

The first time I throw or hit their ball into the woods.

If it happens again I hit their ball back at them.

Never has happened a third time, yet.

The Bear

The first time I just smile and wave figuring they may have made a mistake.
The second time I would wave again and explain we are waiting for the group in front of us.
If, like the group I will be playing with tomorrow, we are slow, I will ask them to play through and wish them a speedy round. I cannot enjoy the game or the company with people like that behind me.
I see enough jerks on the road. I don't want them anywhere near me on a golf course.