How about I shout at someone?
Why are you going to shout at someone?
I guess I'm just angry enough to do it.
Shouting at someone may feel a bit cathartic to you, but to them it will just be hurtful. Do you want to hurt this random person?
Being rude is necessary sometimes.
It is never really necessary to attempt to hurt others, especially not by yelling. Try taking some breaths and getting over the anger yourself.