What cultural faux pas should I try to avoid making in Brasilia?

"In Brasilia, it is important to be aware of cultural norms and etiquette. It is considered rude to be late for appointments or social engagements, so it is important to arrive on time. It is also important to dress modestly and conservatively, especially when visiting religious sites. It is also important to be respectful of local customs and traditions, and to avoid making negative comments about the country or its people. Additionally, it is important to be aware of the local language and to avoid speaking English or any other language in public. Finally, it is important to be aware of the local laws and regulations, and to avoid engaging in any activities that are illegal in Brazil," remarked another expat in Brasilia, Brazil.