Color me skeptical. Sounds too strange. Trump supporters are normally appreciative and polite.
The accusation is that their key funding is from Home Depot, who advocates low wages, mass immigration, etc.
The idea is that Charlie Kirk is a prominent benefactor of the PAYtriots of Conservativism, Inc.
The aim of the disruptors was almost certainly to replicate at UCLA the imbroglio that occured at a similar presentation one week ago at Ohio State, when Kirk encountered numerous accusations that he was PAYtriot serving to ensure that the borders of the USA remain open.
My own believe is these disruptors are okay with Trump and Trump Jr. but deeply suspicious of Charlie Kirk and his paymasters and they are inspired by online commetator and internet personality, Nick Fuentes.