When I don't follow my plan.
Ditto.
Traders can't get angry at the market. It has a "nature", and they know what that is. If the market makes you angry, you'd best not play. You can only get mad at yourself... almost always from lack of discipline.
those type of traders pay for the college education of the children of floor traders /professional traders.I agree on principle, but people are often irrational and they do get angry at the market. The thing is to learn not to do that.

I sometimes lose patience while trading. When i have to just wait and wait for the price to move in the right direction. Patience is not a strong suit of mine but i am working on it. I have been trying meditation for some time and it is proving to be really helpful.