I have been part of and party to various Social Justice movements in the last 25 years, Poll Tax, Animal Rights, Anti-racism, Student politics, anti capitalism etc. etc. and I have been a member of active groups, marching and other protest activities. The people you meet in these movements often are angry, vocal, passionate and pro-active. Sometimes to the exclusion of other interests, we need people like that to energise and inspire others. If everyone reasoned like the woman in this video nothing would ever fucking change! If we all sat around being reasonable and apologist and talking nicely and demurely that would be lovely but it is not possible for everyone to be that passive.
There are a lot of things wrong in our society - and more importantly it is more wrong for certain sectors of the population. I am privileged, I have a comfortable home, enough food, good schools for my children, I am the same colour as most of the other people in my country, I am well educated, free to move where I want to without fear, there is no war in my country. I am not going to dictate how other people in less privileged positions should feel about the world and their place in it. Or tell someone I feel uncomfortable because their outrage is upsetting me? How dare I?