Well, there was more than just one photo; I have seen a few videos of one of them, that's why I said the expression is stuck. The photo was merely most convenient to share to illustrate the point.
But of course the same argument could be applied here, that the videos were selected for displaying the person in bad light.
And the people were probably selected for being easily displayed in a bad light.
I just did a totally scientific experiment. I determined a perfectly fair and unbiased sample of leading names in social justice by (1) thinking what names come to mind when I think about "SJ" or "feminism" and (2) putting "leading advocate of social justice" into Google. I then looked for pictures of the resulting people (once again, Google is my friend).
In the resulting images, there were maybe one or two wearing something a bit like that sourly-...
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