Getting royally pissed off is a bad thing only if it is caused by something trivial. If getting cut
off in traffic enrages you and puts a dark cloud over your day, then, yeah, that's not a reasonable reaction. But, if you are someone who NEVER gets angry but just calmly takes things as they come---I don't trust you.
I admire passion. I respect people who BELIEVE in something and are willing to stand up, look you in the eye and tell you why. In the same vein, I respect and admire people who are willing to loudly say "HELL NO!" when people push them to agree with nonsense, condone cruelty or ignore criminality.
It has been said that reason is the rudder that steers our ship, but that passion is the wind that fills the sails and drives us forward. We need both if we are to successfully navigate through life.
Righteous anger that fills your sails and propels you to right a wrong should never be the cause of shame or embarrassment. The only people who never get angry are those who don't care.