I feel disrespected with my friends' actions - do i have the right to be angry?

I don't know if there was drinking, but these things happen. Best to either discuss it with your friends, or just carry on and get your things. You don't want to lose good friends over some minor incident. Next time, defend yourself. As far as your right to be angry, there is a range of emotions. It is not good for your body to be angry or enraged. Take some deep breaths. Then, regain your composure. It is not that easy to make a whole set of new friends. These deep confrontations don't usually end well, nor does dramatic exits.