Mainly because they’re the losers of globalism, and the failed integration of immigrants. They can only afford to rent in areas that immigrants are pushed into for the same reason. So their kids go to school in classes where almost no education is possible because more than half the children can’t speak German, and they are subject to crime and run-down surroundings.
Then it’s easy to rile them up against immigrants, which seem to be the cause of their problems, instead of the upper class that actually caused all this, through the use of weaponized social media.