Hamas led the rally, which was against the current Egyptian government.
One of the banners that they were carrying included a slogan that is spreading through Facebook and other media.
"Hitler killed the Jews for his people, al-Sisi kills his people for the Jews."
So in one tiny slice of time, we have Arab justification of the Holocaust, antisemitic conspiracy theories, and a desecration of the Jews' holiest place with people who want to ethnically cleanse all Jews from the region.
In other words, it is barely worth reporting in the media.
UPDATE: Photo:
(h/t Sara)