It is teen thugh "oh look how cool and bad-ass I am". It the result of being able to do what you will while leadership in schools and society make excuses for thug behavior instead of holding the thugs accountable. This is not "political protest" it is thug life in action. They just know if they give it a political gloss they will not pay any price for their criminality.
If it where Trumpers out there mass arrests would all ready been make and hysteria about "violence" would have all ready broken out in the "Press".