I decided to double check and WaPo has actually talked about it in multiple articles, but no one refers to anything above "thousands". AP News refers to a pro-Israeli protest as being in the "tens of thousands" while referring to this one as "thousands"

This contradict the assumption that Pax Americana major media allow representation from all side since those that does not favor Pax Americana get censored from major media and since the slightest perceived criticism towards Pax Americana are falsely framed as the representative of the whole opposition to Pax Americana in general. They could have construed the rebellion as acts by spoiled kids or evidence of decaying morality, but these construal would be made by the socially conservative Liberals who do not control the major media.