It’s not bad to be angry sometimes. If someone step on my feet, I complain. It’s human. Any human feeling is welcome.
We tend to expect the best face in others and we tend to show our best face. Isn’t it called hypocrisy?
After each angriness, there’s something to explore.
If you care of the person, you will see beyond this reaction.
Everyone feels angry one time or another and there’s always a reason, there, waiting to be understood.