I played today with my dad and was getting quite frustrated because I asked at the start what tee's we were going to play from, I said I wanted to play the blues - which were the second longest on the course. He said he was okay with that then on like the fourth hole he says he is going to switch to the white because he is playing bad (which are a bit further up), then later he switches back to the blue.
Is this against golf rules? I know at the very least it must be against golf etiquette, it seems dishonest to switch tees in the middle of a round but maybe I am being stupid. Some input would be appreciated.