Here's everything we know.
>Group of boys from a Catholic school are on a school trip to the March for Life
>Their teacher chaperones keep them in a specific area while they wait for other students
>They sing their school songs when a Native American man approaches them for virtually no reason while chanting and banging on a drum: https://twitter.com/mariajudy_/status/1086681831804674048
>The man is singing the AIM song, an "American Indian Movement" nationalist song. The AIM was responsible for dozens of deaths throughout the 60s and 70s
>He decides to violate the Catholics' personal space for literally no reason while banging on a drum and singing an Indian song
>He's followed by about 10 "provocateurs" / activists taping the entire thing
>The boys intersperse standing motionlessly with singing their own songs until the man stops
This is what they are mad about. THIS IS LITERALLY WHAT HAPPENED. A man, for no reason, decided to get in the middle of a group of Catholic children who were protesting the deaths of unborn children while singing their school anthem. THEY didn't start anything. THEY literally did not move the entire time.
Also, NOBODY sang "build that wall". I guess when you're already a lying abomination there's no reason not to include another lie, but this just literally didn't happen.