Assimilationism, often intertwined with white supremacy, profoundly affects multicultural societies like Brazil, where indigenous heritage and colonial histories intersect. The concept advocates for a dominant culture to absorb minority cultures, which can marginalize diverse identities and traditions. In Brazil, this manifests in the tensions between honoring indigenous customs and the colonial legacy that still influences societal norms and politics. Carnival exemplifies a cultural space where these dynamics play out. Traditionally, carnival is a celebration embracing diverse costumes, including crossdressing, symbolizing freedom and cultural expression. However, assimilationist attitudes may seek to restrict or redefine such expressions to fit a singular cultural narrative, undermining the richness of Brazil’s multicultural fabric. The hashtag topics of immigration and politics also relate significantly to this discourse. Immigration brings new cultural influences, contributing to Brazil's diversity but also challenging existing power structures and cultural hierarchies. Political movements and policies can either support multicultural coexistence or push assimilationist agendas that reinforce systemic inequalities. For truly inclusive societies, it is vital to recognize assimilationism as a form of white supremacy that insists on cultural dominance rather than mutual respect and coexistence. Embracing Brazil’s indigenous and colonial histories equally, and fostering spaces where diverse cultures can thrive without forced assimilation, enriches the social and cultural landscape. Understanding these issues helps in supporting social justice, multiculturalism, and the celebration of unique cultural identities across Brazil and beyond.