Flags are gross. If you're chauvanistic enough that seeing a burning flag upsets you, or (in Denmark's case) so afraid of backlash that you ban that dorm of political speech, what does it say about your country? I don't care if it's the American flag, ISIS, swastika, gay pride, whatever. In an ideal world there would be no need for flags, not even at the Olympics.
edit: replace lazy bore millenials with "hot wife"