1) +95% of the population live on the coast very far away from the Amazon. Most of the population has not been there. Most of the coast has a very different jungle biome called Mata Atlantica and the countryside close to the coast is not that different from temperate forest of Europe. That is what most all Brazilians are used to. There is a significant population in the arid northeast though and the cold south as well (which is even more similar to europe).
2) Manaus is the biggest city in the Amazon and it is huge developed place (and has been for decades). You are not in the middle of the jungle if you land in the airport. The countryside around the city is jungle though.
3) Brazilian people do not necessarily like or are used to tacos and spicy food. Mexico is _really_ far away from Brazil.