Final answer:
Chateauvert highlights that the mainstream LGBT movement often ignores the involvement of transgender activists in the Stonewall Inn riots of 1969, despite their critical role in the event and in the broader struggle for LGBTQ rights.
Step-by-step explanation:
According to Chateauvert, the aspect of the Stonewall Inn riots of 1969 that is often ignored by the mainstream LGBT movement is A. The involvement of transgender activists. These riots were pivotal events and represented the struggle and resistance of the LGBTQ community against police harassment and discrimination. Despite the critical role of transgender activists, their contributions and the intersectionality of their struggles within the LGBTQ movement have sometimes been overlooked in historical narratives. Additionally, these activists faced neglect and exclusion in earlier advocacy efforts and only in more recent times has there been a concerted effort to integrate transgender issues into the broader LGBTQ advocacy. The Stonewall riots not only sparked the creation of radical and confrontational groups like the Gay Liberation Front and the Gay Activists Alliance, but also set the stage for annual remembrances and celebrations that highlight the importance of these events and the ongoing fight for equality and liberation.