I found out more about the photo from a translation:
The above picture was taken on August 2014 in Brussels’ airport. It documents Belgian BDS activists protesting “Palestinian blood” spilled by Israelis who fought then in Gaza against Arab terrorists that constantly launched rockets at Israeli citizens.
It was blood-like liquid.
Today, in exactly the same place, real blood was spilled.
By Arab terrorists.
Free Palestine shirts, and pouring paint on the floor.
And in 2014, Brussels probably didn't report it as a "hate crime" either.
They were too busy worrying about "Islamophobia".