What exchange showed every single coin dropping, because that was a pretty limited list. I checked the five big exchanges and at the time of your posting 79% of the coins were even or rising. I failed to find a single moment in the history of crypto when 100% of the coins out there were losing value. Maybe a new exchange for you, because the markets on our side are positive and good.
I think most altcoins are dropping relative to bitcoin. They might rise against fiat.